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  <div class="headertitle"><div class="title">blob_stream_mq_snd_impl.hpp</div></div>
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<a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* Flow-IPC: Core</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright 2023 Akamai Technologies, Inc.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Licensed under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * &quot;License&quot;); you may not use this file except in</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * compliance with the License.  You may obtain a copy</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * of the License at</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *   https://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> *</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * Unless required by applicable law or agreed to in</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * writing, software distributed under the License is</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> * distributed on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * See the License for the specific language governing</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * permissions and limitations under the License. */</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"></span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">/// @file</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"></span><span class="preprocessor">#pragma once</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span> </div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="preprocessor">#include &quot;<a class="code" href="protocol__negotiator_8hpp.html">ipc/transport/protocol_negotiator.hpp</a>&quot;</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="preprocessor">#include &quot;<a class="code" href="blob__stream__mq__impl_8hpp.html">ipc/transport/detail/blob_stream_mq_impl.hpp</a>&quot;</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="preprocessor">#include &quot;<a class="code" href="asio__waitable__native__hndl_8hpp.html">ipc/util/sync_io/asio_waitable_native_hndl.hpp</a>&quot;</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span><span class="preprocessor">#include &quot;<a class="code" href="timer__ev__emitter_8hpp.html">ipc/util/sync_io/detail/timer_ev_emitter.hpp</a>&quot;</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="preprocessor">#include &quot;<a class="code" href="sync__io__fwd_8hpp.html">ipc/util/sync_io/sync_io_fwd.hpp</a>&quot;</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span><span class="preprocessor">#include &quot;<a class="code" href="util_8hpp.html">ipc/util/detail/util.hpp</a>&quot;</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span><span class="preprocessor">#include &lt;flow/async/single_thread_task_loop.hpp&gt;</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="preprocessor">#include &lt;flow/util/blob.hpp&gt;</span></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span><span class="preprocessor">#include &lt;flow/error/error.hpp&gt;</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span><span class="preprocessor">#include &lt;boost/move/make_unique.hpp&gt;</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span><span class="preprocessor">#include &lt;queue&gt;</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span> </div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceipc_1_1transport_1_1sync__io.html">ipc::transport::sync_io</a></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span>{</div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span> </div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span><span class="comment">// Types.</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span><span class="comment"></span> </div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span><span class="comment">/**</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span><span class="comment"> * Internal, non-movable pImpl-lite implementation of sync_io::Blob_stream_mq_sender class template.</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span><span class="comment"> * In and of itself it would have been directly and publicly usable; however Blob_stream_mq_sender adds move semantics</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span><span class="comment"> * which are essential to cooperation with the rest of the API, Channel in particular.</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span><span class="comment"> *</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span><span class="comment"> * @see All discussion of the public API is in Blob_stream_mq_sender doc header; that class template forwards to this</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span><span class="comment"> *      one.  All discussion of pImpl-lite-related notions is also there.  See that doc header first please.  Then come</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span><span class="comment"> *      back here.</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span><span class="comment"> *</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span><span class="comment"> * ### Impl design ###</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span><span class="comment"> * Here&#39;s the thing.  All the `_sender` and `_receiver` stuff historically was written first in</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span><span class="comment"> * what is now sync_io::Native_socket_stream::Impl.  Next, this MQ stuff was written to implement (basically) the same</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span><span class="comment"> * concepts.  So everything is explained, first, in sync_io::Native_socket_stream::Impl.  Next I (ygoldfel)</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span><span class="comment"> * wrote each of `*this` and Blob_stream_mq_receiver_impl.  Therefore:</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span><span class="comment"> *   - `*this` impl is similar to the outgoing-direction, PEER-state logic in that socket-stream `Impl` class.</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span><span class="comment"> *   - And accordingly for incoming-direction and `Blob_stream_mq_receiver_impl`.</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span><span class="comment"> *</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span><span class="comment"> * Therefore we will only explain here the differences between that socket-stream out-pipe algorithms and `*this` impl.</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span><span class="comment"> * Before going into it more consider these points:</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span><span class="comment"> *   - Socket-stream has to worry about both directions *and* (some) interaction between the two (even though it</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span><span class="comment"> *     is full-duplex).  We do not.  There are no mutual concurrency issues to speak of in particular.</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span><span class="comment"> *   - Socket-stream has to worry about going from NULL state to PEER state via CONNECTING (optionally) --</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span><span class="comment"> *     `sync_connect()` at least.  We do not: the `_impl` is always in PEER state (unless ctor failed, but that&#39;s not</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span><span class="comment"> *     interesting).</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span><span class="comment"> *   - Socket-stream must be able to transmit `Native_handle`s, and when applicable they correspond in a tricky way</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span><span class="comment"> *     to byte 1 of the containing send/receive call.  We do not transmit them -- just blobs.</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span><span class="comment"> *   - Socket-stream is operating over a medium that lacks message boundaries; so it must worry about transmitting</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span><span class="comment"> *     only part of a payload, etc.  We do not: a low-level message either goes through, or it does not (would-block).</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span><span class="comment"> *     A user message is 1-1 with a low-level message; so we need not transmit length prefixes.  There are 2 exceptions:</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span><span class="comment"> *     - An auto-ping is a special message.  We express it as an &quot;escape&quot; low-level message (0-length -- as a user</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span><span class="comment"> *       message must not be 0-length) followed by an encoded enumeration value in the following message.</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span><span class="comment"> *     - A graceful-close is a special message.  It is a similarly escaped enumeration value (2 low-level messages).</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span><span class="comment"> *</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span><span class="comment"> * I (ygoldfel) could find no way to reuse code between the 2 counterparts despite similarities.  Some comments</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span><span class="comment"> * and some code *are* repeated, but they are also different enough to where it couldn&#39;t really be avoided.  That said:</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span><span class="comment"> * if you have a reason to understand `Native_socket_stream::Impl` specifically first, then coming back here</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span><span class="comment"> * afterward should be a piece of cake.</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span><span class="comment"> *</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span><span class="comment"> * If not, due to the simplified/reduced purview of a `*this`, it should be quite doable to follow the logic.</span></div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span><span class="comment"> * I won&#39;t pontificate with some overview beyond the above.  Simply grok the following simple protocol, then</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span><span class="comment"> * the `sync_io` pattern (util::sync_io doc header) -- and then jump into the code.</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span><span class="comment"> *</span></div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span><span class="comment"> * (For that last part, we recommend starting with the data member doc headers.)</span></div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span><span class="comment"> *</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span><span class="comment"> * So, the protocol:</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span><span class="comment"> *</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span><span class="comment"> * Two states: steady state, CONTROL state.  In steady state (default) each user message corresponds to a message</span></div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span><span class="comment"> * over the MQ.  By the concept, these cannot be empty.  When it is necessary to send an auto-ping (auto_ping() and</span></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span><span class="comment"> * then periodically as needed), we enter CONTROL state, sending an empty message, then `Control_cmd::S_PING` in</span></div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span><span class="comment"> * the next message, which enters steady state again.  Lastly, `*end_sending()` means we enter CONTROL state</span></div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span><span class="comment"> * similarly, then send `Control_cmd::S_END_SENDING` in the next message, which enters steady state again.</span></div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span><span class="comment"> *</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span><span class="comment"> * ### Protocol negotiation ###</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span><span class="comment"> * This adds a bit of stuff onto the above protocol.  It is very simple; please see Protocol_negotiator doc header;</span></div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span><span class="comment"> * we use that convention.  Moreover, since this is the init version (version 1) of the protocol, we need not worry</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span><span class="comment"> * about speaking more than one version.  So all we do is send the version ahead of the first payload that would</span></div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span><span class="comment"> * otherwise be sent for any reason (user message from send_blob(), end-sending token from `*end_sending()`, or</span></div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span><span class="comment"> * ping from auto_ping(), as of this writing), as a special CONTROL message that encodes the value `-1`, meaning</span></div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span><span class="comment"> * version 1 (as the true `Control_cmd enum` values would be 0, 1, etc.).  Conversely Blob_stream_mq_receiver_impl</span></div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span><span class="comment"> * expects the first message it does receive to be that CONTROL message encoding a version number; but that&#39;s not</span></div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span><span class="comment"> * our concern here, as we are only the outgoing-direction class.</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span><span class="comment"> *</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span><span class="comment"> * @note It is very tempting to do that initial send in lazy fashion: meaning, about to send the first &quot;real&quot; payload?</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span><span class="comment"> *       OK, then pre-pend the negotiation message.  However this can create trouble in the future, if</span></div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span><span class="comment"> *       a future protocol wants to be backwards-compatible (support more than 2 protocol versions): we&#39;ll need</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span><span class="comment"> *       to have received the opposing guy&#39;s preferred version, and thus determined which version to speak,</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span><span class="comment"> *       before sending further (non-negotiation) messages.  Bottom line... the initial send shall occur as soon</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span><span class="comment"> *       as we are operational (start_send_native_handle_ops()).</span></div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span><span class="comment"> *</span></div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span><span class="comment"> * After that, we just speak what we speak... which is the protocol&#39;s initial version -- as there is no other</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span><span class="comment"> * version for us.  (The opposing-side peer is responsible for closing the MQs, if it is unable to speak version 1.)</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span><span class="comment"> *</span></div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span><span class="comment"> * If we do add protocol version 2, etc., in the future, then things *might* become somewhat more complex (but even</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span><span class="comment"> * then not necessarily so).  This is discussed in the `Protocol_negotiator m_protocol_negotiator` member doc header.</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span><span class="comment"> *</span></div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span><span class="comment"> * @note We suggest that if version 2, etc., is/are added, then the above notes be kept more or less intact; then</span></div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span><span class="comment"> *       add updates to show changes.  This will provide a good overview of how the protocol evolved; and our</span></div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span><span class="comment"> *       backwards-compatibility story (even if we decide to have no backwards-compatibility).</span></div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span><span class="comment"> *</span></div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span><span class="comment"> * @tparam Persistent_mq_handle</span></div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span><span class="comment"> *         See Persistent_mq_handle concept doc header.</span></div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span><span class="comment"> */</span></div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Persistent_mq_handle&gt;</div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html">  121</a></span><span class="keyword">class </span><a class="code hl_class" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html">Blob_stream_mq_sender_impl</a> :</div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span>  <span class="keyword">public</span> <a class="code hl_class" href="classipc_1_1transport_1_1Blob__stream__mq__base__impl.html">Blob_stream_mq_base_impl</a>&lt;Persistent_mq_handle&gt;,</div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span>  <span class="keyword">public</span> flow::log::Log_context,</div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span>  <span class="keyword">private</span> boost::noncopyable <span class="comment">// And non-movable.</span></div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span>{</div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span><span class="keyword">public</span>:</div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span>  <span class="comment">// Types.</span></div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span><span class="comment"></span> </div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span><span class="comment">  /// Short-hand for our base with `static` goodies at least.</span></div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a5a36bff3c8346f952b154e081817f53c">  130</a></span><span class="comment"></span>  <span class="keyword">using </span><a class="code hl_class" href="classipc_1_1transport_1_1Blob__stream__mq__base__impl.html">Base</a> = <a class="code hl_class" href="classipc_1_1transport_1_1Blob__stream__mq__base__impl.html">Blob_stream_mq_base_impl&lt;Persistent_mq_handle&gt;</a>;</div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span><span class="comment"></span> </div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span><span class="comment">  /// Short-hand for template arg for underlying MQ handle type.</span></div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a0e32cf8f7e9d6040925bcaf9da36515b">  133</a></span><span class="comment"></span>  <span class="keyword">using </span><a class="code hl_class" href="classipc_1_1transport_1_1Persistent__mq__handle.html">Mq</a> = <span class="keyword">typename</span> <a class="code hl_typedef" href="classipc_1_1transport_1_1Blob__stream__mq__base__impl.html#a8fac0ed5fff23aa42e0a601db6fee42d">Base::Mq</a>;</div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span> </div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span>  <span class="comment">// Constructors/destructor.</span></div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span><span class="comment"></span> </div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span><span class="comment">   * See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span><span class="comment">   *</span></div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span><span class="comment">   * @param logger_ptr</span></div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span><span class="comment">   *        See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span><span class="comment">   * @param mq_moved</span></div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span><span class="comment">   *        See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span><span class="comment">   * @param nickname_str</span></div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span><span class="comment">   *        See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span><span class="comment">   * @param err_code</span></div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span><span class="comment">   *        See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span><span class="comment">   */</span></div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span>  <span class="keyword">explicit</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a71caa7f5002886b2c0717645945d7144">Blob_stream_mq_sender_impl</a>(flow::log::Logger* logger_ptr, <a class="code hl_typedef" href="namespaceipc_1_1util.html#ae6ac47812a90d1287c61e0b7de7bc4f5">util::String_view</a> nickname_str,</div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span>                                      <a class="code hl_class" href="classipc_1_1transport_1_1Persistent__mq__handle.html">Mq</a>&amp;&amp; mq_moved, <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>* err_code);</div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span><span class="comment"></span> </div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span><span class="comment">  /// See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span><span class="comment"></span>  <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#afe0b25b57614615d0672c40cf8f58170">~Blob_stream_mq_sender_impl</a>();</div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span> </div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span>  <span class="comment">// Methods.</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno">  156</span><span class="comment"></span> </div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span><span class="comment">   * See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span><span class="comment">   *</span></div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span><span class="comment">   * @tparam Create_ev_wait_hndl_func</span></div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span><span class="comment">   *         See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span><span class="comment">   * @param create_ev_wait_hndl_func</span></div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span><span class="comment">   *        See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span><span class="comment">   * @return See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno">  165</span><span class="comment">   */</span></div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span>  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> Create_ev_wait_hndl_func&gt;</div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span>  <span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#aa16854340cdf194120efd08f711c74f9">replace_event_wait_handles</a>(<span class="keyword">const</span> Create_ev_wait_hndl_func&amp; create_ev_wait_hndl_func);</div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span><span class="comment"></span> </div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span><span class="comment">   * See Blob_stream_mq_sender counterpart, but assuming PEER state.</span></div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span><span class="comment">   *</span></div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span><span class="comment">   * @return See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno">  173</span><span class="comment">   */</span></div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno">  174</span>  <span class="keywordtype">size_t</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ae56c0c2aeb9fa3c34c364ec46a506994">send_blob_max_size</a>() <span class="keyword">const</span>;</div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno">  175</span><span class="comment"></span> </div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno">  176</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno">  177</span><span class="comment">   * See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno">  178</span><span class="comment">   *</span></div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno">  179</span><span class="comment">   * @param ev_wait_func</span></div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span><span class="comment">   *        See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno">  181</span><span class="comment">   * @return See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno">  182</span><span class="comment">   */</span></div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno">  183</span>  <span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#aa3116afe888df718c4ae10befcf2a16f">start_send_blob_ops</a>(<a class="code hl_typedef" href="namespaceipc_1_1util_1_1sync__io.html#aa0b9a3cc6bdc7dedbef4f9e06851aa24">util::sync_io::Event_wait_func</a>&amp;&amp; ev_wait_func);</div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno">  184</span><span class="comment"></span> </div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno">  185</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno">  186</span><span class="comment">   * See Blob_stream_mq_sender counterpart, but assuming PEER state.</span></div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno">  187</span><span class="comment">   *</span></div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno">  188</span><span class="comment">   * @param blob</span></div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno">  189</span><span class="comment">   *        See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno">  190</span><span class="comment">   * @param err_code</span></div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno">  191</span><span class="comment">   *        See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno">  192</span><span class="comment">   * @return See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno">  193</span><span class="comment">   */</span></div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno">  194</span>  <span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#aba05c51d1033a4ea4ca03679f2fa1f8c">send_blob</a>(<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc_1_1util.html#ae0be7edba7e30ffa3f8b742af621f2ab">util::Blob_const</a>&amp; blob, <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>* err_code);</div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno">  195</span><span class="comment"></span> </div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno">  196</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno">  197</span><span class="comment">   * See Blob_stream_mq_sender counterpart, but assuming PEER state.</span></div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno">  198</span><span class="comment">   *</span></div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno">  199</span><span class="comment">   * @param sync_err_code</span></div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno">  200</span><span class="comment">   *        See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno">  201</span><span class="comment">   * @param on_done_func</span></div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno">  202</span><span class="comment">   *        See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno">  203</span><span class="comment">   * @return See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno">  204</span><span class="comment">   */</span></div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno">  205</span>  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> Task_err&gt;</div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno">  206</span>  <span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a4709b00fb1a8fc0ea63535d0a47f15f0">async_end_sending</a>(<a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>* sync_err_code, Task_err&amp;&amp; on_done_func);</div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno">  207</span><span class="comment"></span> </div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno">  208</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno">  209</span><span class="comment">   * See Blob_stream_mq_sender counterpart, but assuming PEER state.</span></div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno">  210</span><span class="comment">   *</span></div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno">  211</span><span class="comment">   * @return See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno">  212</span><span class="comment">   */</span></div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno">  213</span>  <span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a66bdd766d92029aa20d50b97edae0ce5">end_sending</a>();</div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno">  214</span><span class="comment"></span> </div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno">  215</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno">  216</span><span class="comment">   * See Blob_stream_mq_sender counterpart, but assuming PEER state.</span></div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno">  217</span><span class="comment">   *</span></div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno">  218</span><span class="comment">   * @param period</span></div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno">  219</span><span class="comment">   *        See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno">  220</span><span class="comment">   * @return See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno">  221</span><span class="comment">   */</span></div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno">  222</span>  <span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a19e169b59c90ceac14671aa324a00649">auto_ping</a>(<a class="code hl_typedef" href="namespaceipc_1_1util.html#ac66141280c3b7295a86b65209f31cc58">util::Fine_duration</a> period);</div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno">  223</span><span class="comment"></span> </div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno">  224</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno">  225</span><span class="comment">   * See Blob_stream_mq_sender counterpart, but assuming PEER state.</span></div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno">  226</span><span class="comment">   * @return See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno">  227</span><span class="comment">   */</span></div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno">  228</span>  <span class="keyword">const</span> std::string&amp; <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ad30ee34fd91e68a084d207763e753f6d">nickname</a>() <span class="keyword">const</span>;</div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno">  229</span><span class="comment"></span> </div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno">  230</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno">  231</span><span class="comment">   * See Blob_stream_mq_sender counterpart, but assuming PEER state.</span></div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno">  232</span><span class="comment">   *</span></div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno">  233</span><span class="comment">   * @return See Blob_stream_mq_sender counterpart.</span></div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno">  234</span><span class="comment">   */</span></div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno">  235</span>  <span class="keyword">const</span> <a class="code hl_class" href="classipc_1_1util_1_1Shared__name.html">Shared_name</a>&amp; <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a0763f3a2891a2a0e41f3ff15f06db7cc">absolute_name</a>() <span class="keyword">const</span>;</div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno">  236</span> </div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno">  237</span><span class="keyword">private</span>:</div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno">  238</span>  <span class="comment">// Types.</span></div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno">  239</span><span class="comment"></span> </div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno">  240</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno">  241</span><span class="comment">   * Data store representing a payload corresponding to exactly one attempted async write-op, albeit</span></div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno">  242</span><span class="comment">   * used if and only if we encounter would-block in `send_blob()` or on_ev_auto_ping_now_timer_fired()</span></div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno">  243</span><span class="comment">   * or `*end_sending()` and have to queue (and therefore one-time-copy) data in #m_pending_payloads_q.</span></div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno">  244</span><span class="comment">   *</span></div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno">  245</span><span class="comment">   * Note this does *not* represent an original user message given to Native_socket_stream::send_blob()</span></div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno">  246</span><span class="comment">   * but rather an actual single low-level message to send over #m_mq.  (Spoiler alert: most low-level payloads</span></div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno">  247</span><span class="comment">   * are indeed simply user messages; but each of graceful-close and auto-ping is represented by</span></div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno">  248</span><span class="comment">   * an &quot;escape&quot; payload -- empty since empty user messages are disallowed -- followed by an enumeration-storing</span></div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno">  249</span><span class="comment">   * payload specifying which &quot;control&quot; message it is.  Each of these is termed a CONTROL message.)</span></div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno">  250</span><span class="comment">   *</span></div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno">  251</span><span class="comment">   * We store them in queue via #Ptr.</span></div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno">  252</span><span class="comment">   */</span></div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno"><a class="line" href="structipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_1_1Snd__low__lvl__payload.html">  253</a></span>  <span class="keyword">struct </span><a class="code hl_struct" href="structipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_1_1Snd__low__lvl__payload.html">Snd_low_lvl_payload</a></div>
<div class="line"><a id="l00254" name="l00254"></a><span class="lineno">  254</span>  {</div>
<div class="line"><a id="l00255" name="l00255"></a><span class="lineno">  255</span>    <span class="comment">// Types.</span></div>
<div class="line"><a id="l00256" name="l00256"></a><span class="lineno">  256</span><span class="comment"></span> </div>
<div class="line"><a id="l00257" name="l00257"></a><span class="lineno">  257</span><span class="comment">    /// Short-hand for `unique_ptr` to this.</span></div>
<div class="line"><a id="l00258" name="l00258"></a><span class="lineno"><a class="line" href="structipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_1_1Snd__low__lvl__payload.html#ad30cb6fc47d87a52a665e748b48e47ed">  258</a></span><span class="comment"></span>    <span class="keyword">using </span><a class="code hl_typedef" href="structipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_1_1Snd__low__lvl__payload.html#ad30cb6fc47d87a52a665e748b48e47ed">Ptr</a> = boost::movelib::unique_ptr&lt;Snd_low_lvl_payload&gt;;</div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno">  259</span> </div>
<div class="line"><a id="l00260" name="l00260"></a><span class="lineno">  260</span>    <span class="comment">// Data.</span></div>
<div class="line"><a id="l00261" name="l00261"></a><span class="lineno">  261</span><span class="comment"></span> </div>
<div class="line"><a id="l00262" name="l00262"></a><span class="lineno">  262</span><span class="comment">    /**</span></div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno">  263</span><span class="comment">     * The buffer to transmit in the payload; possibly `.empty()`.  Note that this is the actual buffer</span></div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno">  264</span><span class="comment">     * and not a mere location/size of an existing blob somewhere.</span></div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno">  265</span><span class="comment">     * ### Rationale ###</span></div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno">  266</span><span class="comment">     * Why not just have `using Snd_low_lvl_payload = unique_ptr&lt;Blob&gt;`?  Answer: No huge reason.  Just</span></div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno">  267</span><span class="comment">     * consistency with sync_io::Native_socket_stream::Impl which has a quite similar outgoing-direction</span></div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno">  268</span><span class="comment">     * algorithm and therefore type but with a more complex payload (they&#39;ve got `Native_handle`s to worry about).</span></div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno">  269</span><span class="comment">     */</span></div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno"><a class="line" href="structipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_1_1Snd__low__lvl__payload.html#a57c03ef0a637b6943df965ae0e4bf50c">  270</a></span>    flow::util::Blob <a class="code hl_variable" href="structipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_1_1Snd__low__lvl__payload.html#a57c03ef0a637b6943df965ae0e4bf50c">m_blob</a>;</div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno">  271</span>  }; <span class="comment">// struct Snd_low_lvl_payload</span></div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno">  272</span><span class="comment"></span> </div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno">  273</span><span class="comment">  /// Short-hand for Blob_stream_mq_base_impl::Control_cmd.</span></div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a62ce20c2a91367330b92c8b392524b32">  274</a></span><span class="comment"></span>  <span class="keyword">using </span><a class="code hl_enumeration" href="classipc_1_1transport_1_1Blob__stream__mq__base__impl.html#a2e46672d40fbf38cf6054edfad69e705">Control_cmd</a> = <span class="keyword">typename</span> <a class="code hl_enumeration" href="classipc_1_1transport_1_1Blob__stream__mq__base__impl.html#a2e46672d40fbf38cf6054edfad69e705">Base::Control_cmd</a>;</div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno">  275</span> </div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno">  276</span>  <span class="comment">// Methods.</span></div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno">  277</span><span class="comment"></span> </div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno">  278</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno">  279</span><span class="comment">   * Helper that returns `true` silently if `start_*_ops()` has been called; else</span></div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno">  280</span><span class="comment">   * logs WARNING and returns `false`.</span></div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno">  281</span><span class="comment">   *</span></div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno">  282</span><span class="comment">   * @param context</span></div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno">  283</span><span class="comment">   *        For logging: the algorithmic context (function name or whatever).</span></div>
<div class="line"><a id="l00284" name="l00284"></a><span class="lineno">  284</span><span class="comment">   * @return See above.</span></div>
<div class="line"><a id="l00285" name="l00285"></a><span class="lineno">  285</span><span class="comment">   */</span></div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno">  286</span>  <span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#aa7f092848ef3691dcf97182e5b3e2383">op_started</a>(<a class="code hl_typedef" href="namespaceipc_1_1util.html#ae6ac47812a90d1287c61e0b7de7bc4f5">util::String_view</a> context) <span class="keyword">const</span>;</div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno">  287</span><span class="comment"></span> </div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno">  288</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno">  289</span><span class="comment">   * `*end_sending()` body.</span></div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno">  290</span><span class="comment">   *</span></div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno">  291</span><span class="comment">   * @param sync_err_code_ptr_or_null</span></div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno">  292</span><span class="comment">   *        See async_end_sending().  Null if and only if invoked from the no-arg end_sending().</span></div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno">  293</span><span class="comment">   *        Note well: even if `async_end_sending(sync_err_code = nullptr)` was used, this must not be null.</span></div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno">  294</span><span class="comment">   * @param on_done_func_or_empty</span></div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno">  295</span><span class="comment">   *        See async_end_sending().  `.empty() == true` if and only if invoked from the no-arg end_sending().</span></div>
<div class="line"><a id="l00296" name="l00296"></a><span class="lineno">  296</span><span class="comment">   * @return See async_end_sending() and end_sending().</span></div>
<div class="line"><a id="l00297" name="l00297"></a><span class="lineno">  297</span><span class="comment">   */</span></div>
<div class="line"><a id="l00298" name="l00298"></a><span class="lineno">  298</span>  <span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#adc7d43cbe05d4ad239d7abcf010955db">async_end_sending_impl</a>(<a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>* sync_err_code_ptr_or_null,</div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno">  299</span>                              flow::async::Task_asio_err&amp;&amp; on_done_func_or_empty);</div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno">  300</span><span class="comment"></span> </div>
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno">  301</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno">  302</span><span class="comment">   * Handler for the async-wait, via util::sync_io::Timer_event_emitter, of the auto-ping timer firing;</span></div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno">  303</span><span class="comment">   * if all is cool, sends auto-ping and schedules the next such async-wait.  That wait itself can be rescheduled</span></div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno">  304</span><span class="comment">   * when non-idleness (other send attempts) occurs.  If all is not cool -- sends finished via `*end_sending()`,</span></div>
<div class="line"><a id="l00305" name="l00305"></a><span class="lineno">  305</span><span class="comment">   * out-pipe hosed -- then neither sends auto-ping nor schedules another.</span></div>
<div class="line"><a id="l00306" name="l00306"></a><span class="lineno">  306</span><span class="comment">   */</span></div>
<div class="line"><a id="l00307" name="l00307"></a><span class="lineno">  307</span>  <span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ad84b0f43cd4d1329c8bac6ea1376d3ca">on_ev_auto_ping_now_timer_fired</a>();</div>
<div class="line"><a id="l00308" name="l00308"></a><span class="lineno">  308</span><span class="comment"></span> </div>
<div class="line"><a id="l00309" name="l00309"></a><span class="lineno">  309</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00310" name="l00310"></a><span class="lineno">  310</span><span class="comment">   * Either synchronously sends `orig_blob` low-level blob over #m_mq,</span></div>
<div class="line"><a id="l00311" name="l00311"></a><span class="lineno">  311</span><span class="comment">   * or if an async-send is in progress queues it to be sent later; dropping-sans-queuing</span></div>
<div class="line"><a id="l00312" name="l00312"></a><span class="lineno">  312</span><span class="comment">   * allowed under certain circumstances in `avoided_qing` mode.  For details on the latter see below.</span></div>
<div class="line"><a id="l00313" name="l00313"></a><span class="lineno">  313</span><span class="comment">   *</span></div>
<div class="line"><a id="l00314" name="l00314"></a><span class="lineno">  314</span><span class="comment">   * #m_pending_err_code (pre-condition: it is falsy) is set to the error to ultimately return; and if no such</span></div>
<div class="line"><a id="l00315" name="l00315"></a><span class="lineno">  315</span><span class="comment">   * outgoing-pipe-hosing is synchronously encountered it is left untouched.  In particular, if falsy upon return,</span></div>
<div class="line"><a id="l00316" name="l00316"></a><span class="lineno">  316</span><span class="comment">   * you may call this again to send the next low-level payload.  Otherwise #m_mq cannot be subsequently used</span></div>
<div class="line"><a id="l00317" name="l00317"></a><span class="lineno">  317</span><span class="comment">   * (it is hosed).  Thus we maintain the invariant that #m_mq is null if and only if that guy is truthy.</span></div>
<div class="line"><a id="l00318" name="l00318"></a><span class="lineno">  318</span><span class="comment">   *</span></div>
<div class="line"><a id="l00319" name="l00319"></a><span class="lineno">  319</span><span class="comment">   * ### `avoided_qing` mode for auto-ping ###</span></div>
<div class="line"><a id="l00320" name="l00320"></a><span class="lineno">  320</span><span class="comment">   * If `avoided_qing_or_null` is null, then see above.  If it points to a `bool`, though, then:</span></div>
<div class="line"><a id="l00321" name="l00321"></a><span class="lineno">  321</span><span class="comment">   * the above behavior is slightly modified as follows.  Suppose `orig_blob` encodes an</span></div>
<div class="line"><a id="l00322" name="l00322"></a><span class="lineno">  322</span><span class="comment">   * auto-ping message (see auto_ping()).  Its purpose is to inform the</span></div>
<div class="line"><a id="l00323" name="l00323"></a><span class="lineno">  323</span><span class="comment">   * opposing side that we are alive/not idle.  So suppose this method is unable to send `orig_blob`,</span></div>
<div class="line"><a id="l00324" name="l00324"></a><span class="lineno">  324</span><span class="comment">   * either because there are already-queued data waiting to be sent pending writability (due to earlier would-block),</span></div>
<div class="line"><a id="l00325" name="l00325"></a><span class="lineno">  325</span><span class="comment">   * or because the MQ has already-queued bytes waiting to be popped by receiver, and there is no</span></div>
<div class="line"><a id="l00326" name="l00326"></a><span class="lineno">  326</span><span class="comment">   * space there to enqueue `orig_blob`.  Then the receiver must not be keeping up with us, and the next</span></div>
<div class="line"><a id="l00327" name="l00327"></a><span class="lineno">  327</span><span class="comment">   * pop of the MQ will get *some* message, even if it&#39;s not the auto-ping we wanted to send;</span></div>
<div class="line"><a id="l00328" name="l00328"></a><span class="lineno">  328</span><span class="comment">   * hence they&#39;ll know we are not-idle without the auto-ping.  So in that case this method shall:</span></div>
<div class="line"><a id="l00329" name="l00329"></a><span class="lineno">  329</span><span class="comment">   *   - disregard `orig_blob` (do not queue it -- drop it, as it would be redundant anyway);</span></div>
<div class="line"><a id="l00330" name="l00330"></a><span class="lineno">  330</span><span class="comment">   *   - return `true` if and only if the size of the out-queue is 0 (though as of this writing the caller should</span></div>
<div class="line"><a id="l00331" name="l00331"></a><span class="lineno">  331</span><span class="comment">   *     not care: auto-ping is a fire-and-forget operation, as long as it does not detect a pipe-hosing error);</span></div>
<div class="line"><a id="l00332" name="l00332"></a><span class="lineno">  332</span><span class="comment">   *   - set `*avoided_qing_or_null`.</span></div>
<div class="line"><a id="l00333" name="l00333"></a><span class="lineno">  333</span><span class="comment">   *</span></div>
<div class="line"><a id="l00334" name="l00334"></a><span class="lineno">  334</span><span class="comment">   * If `avoided_qing_or_null` is not null, but no error or would-block was encountered -- meaning it was</span></div>
<div class="line"><a id="l00335" name="l00335"></a><span class="lineno">  335</span><span class="comment">   * placed into MQ synchronously -- then `*avoided_qing_or_null` is set to `false`.</span></div>
<div class="line"><a id="l00336" name="l00336"></a><span class="lineno">  336</span><span class="comment">   *</span></div>
<div class="line"><a id="l00337" name="l00337"></a><span class="lineno">  337</span><span class="comment">   * Why do we even have this as an out-arg?  Answer: It is to be used for payload 1 of a CONTROL PING message;</span></div>
<div class="line"><a id="l00338" name="l00338"></a><span class="lineno">  338</span><span class="comment">   * so if this is set to `true`, then caller should *not* sync_write_or_q_payload() again for payload 2.</span></div>
<div class="line"><a id="l00339" name="l00339"></a><span class="lineno">  339</span><span class="comment">   * Otherwise (assuming #m_mq is still alive) it should.</span></div>
<div class="line"><a id="l00340" name="l00340"></a><span class="lineno">  340</span><span class="comment">   *</span></div>
<div class="line"><a id="l00341" name="l00341"></a><span class="lineno">  341</span><span class="comment">   * @param orig_blob</span></div>
<div class="line"><a id="l00342" name="l00342"></a><span class="lineno">  342</span><span class="comment">   *        Blob to send.  Empty blob is allowed.</span></div>
<div class="line"><a id="l00343" name="l00343"></a><span class="lineno">  343</span><span class="comment">   * @param avoided_qing_or_null</span></div>
<div class="line"><a id="l00344" name="l00344"></a><span class="lineno">  344</span><span class="comment">   *        See above.</span></div>
<div class="line"><a id="l00345" name="l00345"></a><span class="lineno">  345</span><span class="comment">   * @return `false` if outgoing-direction pipe still has queued stuff in it that must be sent once transport</span></div>
<div class="line"><a id="l00346" name="l00346"></a><span class="lineno">  346</span><span class="comment">   *         becomes writable; `true` otherwise.  If `true` is returned, but `avoided_qing_or_null != nullptr`, then</span></div>
<div class="line"><a id="l00347" name="l00347"></a><span class="lineno">  347</span><span class="comment">   *         possibly `orig_blob` was not sent (at all); was dropped (check `*avoided_qing_or_null` to see if so).</span></div>
<div class="line"><a id="l00348" name="l00348"></a><span class="lineno">  348</span><span class="comment">   */</span></div>
<div class="line"><a id="l00349" name="l00349"></a><span class="lineno">  349</span>  <span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a25e79124ef73da11430ce3060587f12a">sync_write_or_q_payload</a>(<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc_1_1util.html#ae0be7edba7e30ffa3f8b742af621f2ab">util::Blob_const</a>&amp; orig_blob, <span class="keywordtype">bool</span>* avoided_qing_or_null);</div>
<div class="line"><a id="l00350" name="l00350"></a><span class="lineno">  350</span><span class="comment"></span> </div>
<div class="line"><a id="l00351" name="l00351"></a><span class="lineno">  351</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00352" name="l00352"></a><span class="lineno">  352</span><span class="comment">   * Writes the 2 payloads corresponding to CONTROL command `cmd` to #m_mq; if unable to do so synchronously --</span></div>
<div class="line"><a id="l00353" name="l00353"></a><span class="lineno">  353</span><span class="comment">   * either because items are already queued in #m_pending_payloads_q, or MQ is full -- then enqueue 1-2 of the</span></div>
<div class="line"><a id="l00354" name="l00354"></a><span class="lineno">  354</span><span class="comment">   * payloads onto that queue.  In the case of Control_cmd::S_PING it may drop both payloads silently</span></div>
<div class="line"><a id="l00355" name="l00355"></a><span class="lineno">  355</span><span class="comment">   * (see sync_write_or_q_payload() notes regarding `avoided_qing` mode).</span></div>
<div class="line"><a id="l00356" name="l00356"></a><span class="lineno">  356</span><span class="comment">   *</span></div>
<div class="line"><a id="l00357" name="l00357"></a><span class="lineno">  357</span><span class="comment">   * Essentially this combines 1-2 sync_write_or_q_payload() for the specific task of sending out a CONTROL command.</span></div>
<div class="line"><a id="l00358" name="l00358"></a><span class="lineno">  358</span><span class="comment">   * If one desires to send a normal (user) message -- use sync_write_or_q_payload() directly (it shall deal</span></div>
<div class="line"><a id="l00359" name="l00359"></a><span class="lineno">  359</span><span class="comment">   * with a single payload).</span></div>
<div class="line"><a id="l00360" name="l00360"></a><span class="lineno">  360</span><span class="comment">   *</span></div>
<div class="line"><a id="l00361" name="l00361"></a><span class="lineno">  361</span><span class="comment">   * If a sync-write uncovers #m_mq is hosed, then #m_pending_err_code is made truthy.</span></div>
<div class="line"><a id="l00362" name="l00362"></a><span class="lineno">  362</span><span class="comment">   *</span></div>
<div class="line"><a id="l00363" name="l00363"></a><span class="lineno">  363</span><span class="comment">   * @param cmd</span></div>
<div class="line"><a id="l00364" name="l00364"></a><span class="lineno">  364</span><span class="comment">   *        See above.</span></div>
<div class="line"><a id="l00365" name="l00365"></a><span class="lineno">  365</span><span class="comment">   * @return A-la sync_write_or_q_payload(): `false` if outgoing-direction pipe still has stuff in it; `true`</span></div>
<div class="line"><a id="l00366" name="l00366"></a><span class="lineno">  366</span><span class="comment">   *         otherwise.</span></div>
<div class="line"><a id="l00367" name="l00367"></a><span class="lineno">  367</span><span class="comment">   */</span></div>
<div class="line"><a id="l00368" name="l00368"></a><span class="lineno">  368</span>  <span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#af7657579dd859f95c234e447246b9410">sync_write_or_q_ctl_cmd</a>(<a class="code hl_enumeration" href="classipc_1_1transport_1_1Blob__stream__mq__base__impl.html#a2e46672d40fbf38cf6054edfad69e705">Control_cmd</a> cmd);</div>
<div class="line"><a id="l00369" name="l00369"></a><span class="lineno">  369</span><span class="comment"></span> </div>
<div class="line"><a id="l00370" name="l00370"></a><span class="lineno">  370</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00371" name="l00371"></a><span class="lineno">  371</span><span class="comment">   * Equivalent to sync_write_or_q_ctl_cmd() but takes the raw representation of the command to send;</span></div>
<div class="line"><a id="l00372" name="l00372"></a><span class="lineno">  372</span><span class="comment">   * this allows both sending the `enum Control_cmd` value or the special protocol negotiation payload.</span></div>
<div class="line"><a id="l00373" name="l00373"></a><span class="lineno">  373</span><span class="comment">   * We always send the latter as the first message, and never again; and the receiver side expects this;</span></div>
<div class="line"><a id="l00374" name="l00374"></a><span class="lineno">  374</span><span class="comment">   * after that only regular `Control_cmd`-bearing CONTROL messages are sent and expected.</span></div>
<div class="line"><a id="l00375" name="l00375"></a><span class="lineno">  375</span><span class="comment">   *</span></div>
<div class="line"><a id="l00376" name="l00376"></a><span class="lineno">  376</span><span class="comment">   * @param raw_cmd</span></div>
<div class="line"><a id="l00377" name="l00377"></a><span class="lineno">  377</span><span class="comment">   *        Either a non-negative value, which equals the cast of a `Control_cmd` to its underlying type;</span></div>
<div class="line"><a id="l00378" name="l00378"></a><span class="lineno">  378</span><span class="comment">   *        or a negative value, which equals the arithmetic negation of our highest (preferred) protocol</span></div>
<div class="line"><a id="l00379" name="l00379"></a><span class="lineno">  379</span><span class="comment">   *        version.  So in the latter case -1 means version 1, -2 means version 2, etc.</span></div>
<div class="line"><a id="l00380" name="l00380"></a><span class="lineno">  380</span><span class="comment">   * @return See sync_write_or_q_ctl_cmd().</span></div>
<div class="line"><a id="l00381" name="l00381"></a><span class="lineno">  381</span><span class="comment">   */</span></div>
<div class="line"><a id="l00382" name="l00382"></a><span class="lineno">  382</span>  <span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ab8230261c54efb813aabc8a80f79fc8d">sync_write_or_q_ctl_cmd_impl</a>(std::underlying_type_t&lt;Control_cmd&gt; raw_cmd);</div>
<div class="line"><a id="l00383" name="l00383"></a><span class="lineno">  383</span><span class="comment"></span> </div>
<div class="line"><a id="l00384" name="l00384"></a><span class="lineno">  384</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00385" name="l00385"></a><span class="lineno">  385</span><span class="comment">   * Initiates async-write over #m_mq of the low-level payload at the head of out-queue</span></div>
<div class="line"><a id="l00386" name="l00386"></a><span class="lineno">  386</span><span class="comment">   * #m_pending_payloads_q, with completion handler also inside this method.</span></div>
<div class="line"><a id="l00387" name="l00387"></a><span class="lineno">  387</span><span class="comment">   * The first step of this is an async-wait via `sync_io` pattern.</span></div>
<div class="line"><a id="l00388" name="l00388"></a><span class="lineno">  388</span><span class="comment">   */</span></div>
<div class="line"><a id="l00389" name="l00389"></a><span class="lineno">  389</span>  <span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a57737a56544ffac3cfd8d130663bb6ce">async_write_q_head_payload</a>();</div>
<div class="line"><a id="l00390" name="l00390"></a><span class="lineno">  390</span> </div>
<div class="line"><a id="l00391" name="l00391"></a><span class="lineno">  391</span>  <span class="comment">// Data.</span></div>
<div class="line"><a id="l00392" name="l00392"></a><span class="lineno">  392</span><span class="comment"></span> </div>
<div class="line"><a id="l00393" name="l00393"></a><span class="lineno">  393</span><span class="comment">  /// See nickname().</span></div>
<div class="line"><a id="l00394" name="l00394"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ab9c3904b9cd89438c1f2de5ec974f814">  394</a></span><span class="comment"></span>  <span class="keyword">const</span> std::string <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ab9c3904b9cd89438c1f2de5ec974f814">m_nickname</a>;</div>
<div class="line"><a id="l00395" name="l00395"></a><span class="lineno">  395</span><span class="comment"></span> </div>
<div class="line"><a id="l00396" name="l00396"></a><span class="lineno">  396</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00397" name="l00397"></a><span class="lineno">  397</span><span class="comment">   * Handles the protocol negotiation at the start of the pipe.</span></div>
<div class="line"><a id="l00398" name="l00398"></a><span class="lineno">  398</span><span class="comment">   *</span></div>
<div class="line"><a id="l00399" name="l00399"></a><span class="lineno">  399</span><span class="comment">   * @see Protocol_negotiator doc header for key background on the topic.  In particular check out the discussion</span></div>
<div class="line"><a id="l00400" name="l00400"></a><span class="lineno">  400</span><span class="comment">   *      &quot;Key tip: Coding for version-1 versus one version versus multiple versions.&quot;</span></div>
<div class="line"><a id="l00401" name="l00401"></a><span class="lineno">  401</span><span class="comment">   *</span></div>
<div class="line"><a id="l00402" name="l00402"></a><span class="lineno">  402</span><span class="comment">   * ### Maintenace/future ###</span></div>
<div class="line"><a id="l00403" name="l00403"></a><span class="lineno">  403</span><span class="comment">   * This version of the software talks only the initial version of the protocol: version 1 by Protocol_negotiator</span></div>
<div class="line"><a id="l00404" name="l00404"></a><span class="lineno">  404</span><span class="comment">   * convention.  (Deities willing, we won&#39;t need to create more, but possibly we will.)  As expained in the</span></div>
<div class="line"><a id="l00405" name="l00405"></a><span class="lineno">  405</span><span class="comment">   * above-mentioned doc header section, we have very little to worry about as the sender: Just send</span></div>
<div class="line"><a id="l00406" name="l00406"></a><span class="lineno">  406</span><span class="comment">   * our version, 1, as the first message (in fact, a special CONTROL message; and we send it first-thing, ahead of the</span></div>
<div class="line"><a id="l00407" name="l00407"></a><span class="lineno">  407</span><span class="comment">   * first payload that would be otherwise sent, whether it&#39;s a user payload, or the end-sending token, or</span></div>
<div class="line"><a id="l00408" name="l00408"></a><span class="lineno">  408</span><span class="comment">   * an auto-ping).  Only version 1 exists, so we simply speak it.</span></div>
<div class="line"><a id="l00409" name="l00409"></a><span class="lineno">  409</span><span class="comment">   *</span></div>
<div class="line"><a id="l00410" name="l00410"></a><span class="lineno">  410</span><span class="comment">   * This *might* change in the future.  If there is a version 2 or later, *and* at some point we decide to maintain</span></div>
<div class="line"><a id="l00411" name="l00411"></a><span class="lineno">  411</span><span class="comment">   * backwards-compatibility (not a no-brainer decision in either direction), meaning we pass a range of 2 versions</span></div>
<div class="line"><a id="l00412" name="l00412"></a><span class="lineno">  412</span><span class="comment">   * or more to Protocol_negotiator ctor, then:</span></div>
<div class="line"><a id="l00413" name="l00413"></a><span class="lineno">  413</span><span class="comment">   *   - We will need to know which version to speak when sending at least *some* of our messages.</span></div>
<div class="line"><a id="l00414" name="l00414"></a><span class="lineno">  414</span><span class="comment">   *   - Normally we&#39;d get this via a separate incoming pipe -- a paired Blob_stream_mq_receiver handling</span></div>
<div class="line"><a id="l00415" name="l00415"></a><span class="lineno">  415</span><span class="comment">   *     a separate associated MQ.  So we&#39;d need:</span></div>
<div class="line"><a id="l00416" name="l00416"></a><span class="lineno">  416</span><span class="comment">   *     - some kind of internal logic to enter a would-block state of sorts (if we need to know the version</span></div>
<div class="line"><a id="l00417" name="l00417"></a><span class="lineno">  417</span><span class="comment">   *       for a certain out-message, and we haven&#39;t been told it yet) during which stuff is queued-up and not</span></div>
<div class="line"><a id="l00418" name="l00418"></a><span class="lineno">  418</span><span class="comment">   *       yet sent until signaled with the negotiated protocol version;</span></div>
<div class="line"><a id="l00419" name="l00419"></a><span class="lineno">  419</span><span class="comment">   *     - some kind of API that would let the paired Blob_stream_mq_receiver signal us to tell us that version,</span></div>
<div class="line"><a id="l00420" name="l00420"></a><span class="lineno">  420</span><span class="comment">   *       when it knows;</span></div>
<div class="line"><a id="l00421" name="l00421"></a><span class="lineno">  421</span><span class="comment">   *     - possibly some kind of API that one could use in the absence of such a paired opposite-facing pipe,</span></div>
<div class="line"><a id="l00422" name="l00422"></a><span class="lineno">  422</span><span class="comment">   *       so that our user can simply tell us what protocol version to speak in lieu of the paired</span></div>
<div class="line"><a id="l00423" name="l00423"></a><span class="lineno">  423</span><span class="comment">   *       Blob_stream_mq_receiver.</span></div>
<div class="line"><a id="l00424" name="l00424"></a><span class="lineno">  424</span><span class="comment">   *</span></div>
<div class="line"><a id="l00425" name="l00425"></a><span class="lineno">  425</span><span class="comment">   * (Just to point a fine point on it: We are *one* direction of a *likely* bidirectional comm pathway.</span></div>
<div class="line"><a id="l00426" name="l00426"></a><span class="lineno">  426</span><span class="comment">   * Protocol_negotiator by definition applies to a bidirectional pathway.  Yet we *can* exist in isolation, with</span></div>
<div class="line"><a id="l00427" name="l00427"></a><span class="lineno">  427</span><span class="comment">   * no partner opposing MQ and therefore no partner local Blob_stream_mq_sender_impl.  If that is indeed the</span></div>
<div class="line"><a id="l00428" name="l00428"></a><span class="lineno">  428</span><span class="comment">   * case, then it is meaningless for *us* to somehow find out what protocol the either side speaks, as the other</span></div>
<div class="line"><a id="l00429" name="l00429"></a><span class="lineno">  429</span><span class="comment">   * side has no way of sending us *anything*!  Hence the dichotomy between those last 2 sub-bullets:</span></div>
<div class="line"><a id="l00430" name="l00430"></a><span class="lineno">  430</span><span class="comment">   * If we exist in isolation and are unidirectional, then you&#39;d best simply tell us what to speak... but</span></div>
<div class="line"><a id="l00431" name="l00431"></a><span class="lineno">  431</span><span class="comment">   * if we&#39;re part of a bidirectional setup, then we can cooperate with the other direction more automagically.</span></div>
<div class="line"><a id="l00432" name="l00432"></a><span class="lineno">  432</span><span class="comment">   *</span></div>
<div class="line"><a id="l00433" name="l00433"></a><span class="lineno">  433</span><span class="comment">   * These are decisions and work for another day, though; it is not relevant until version 2 of this protocol</span></div>
<div class="line"><a id="l00434" name="l00434"></a><span class="lineno">  434</span><span class="comment">   * at the earliest.  That might not even happen.</span></div>
<div class="line"><a id="l00435" name="l00435"></a><span class="lineno">  435</span><span class="comment">   */</span></div>
<div class="line"><a id="l00436" name="l00436"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a28485fe8e4fbeea78f05eadc69a31c20">  436</a></span>  <a class="code hl_class" href="classipc_1_1transport_1_1Protocol__negotiator.html">Protocol_negotiator</a> <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a28485fe8e4fbeea78f05eadc69a31c20">m_protocol_negotiator</a>;</div>
<div class="line"><a id="l00437" name="l00437"></a><span class="lineno">  437</span><span class="comment"></span> </div>
<div class="line"><a id="l00438" name="l00438"></a><span class="lineno">  438</span><span class="comment">  /// See absolute_name().</span></div>
<div class="line"><a id="l00439" name="l00439"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a4ea460de8caacec0ac8f75dd93f6c548">  439</a></span><span class="comment"></span>  <span class="keyword">const</span> <a class="code hl_class" href="classipc_1_1util_1_1Shared__name.html">Shared_name</a> <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a4ea460de8caacec0ac8f75dd93f6c548">m_absolute_name</a>;</div>
<div class="line"><a id="l00440" name="l00440"></a><span class="lineno">  440</span><span class="comment"></span> </div>
<div class="line"><a id="l00441" name="l00441"></a><span class="lineno">  441</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00442" name="l00442"></a><span class="lineno">  442</span><span class="comment">   * The `Task_engine` for `m_mq_ready_*`.  It is necessary to construct those pipe-end objects, but we never</span></div>
<div class="line"><a id="l00443" name="l00443"></a><span class="lineno">  443</span><span class="comment">   * use that guy&#39;s `-&gt;async_*()` APIs -- only non-blocking operations, essentially leveraging boost.asio&#39;s</span></div>
<div class="line"><a id="l00444" name="l00444"></a><span class="lineno">  444</span><span class="comment">   * portable transmission APIs but not its actual, um, async-I/O abilities in this case.  Accordingly we</span></div>
<div class="line"><a id="l00445" name="l00445"></a><span class="lineno">  445</span><span class="comment">   * never load any tasks onto #m_nb_task_engine and certainly never `.run()` (or `.poll()` or ...) it.</span></div>
<div class="line"><a id="l00446" name="l00446"></a><span class="lineno">  446</span><span class="comment">   *</span></div>
<div class="line"><a id="l00447" name="l00447"></a><span class="lineno">  447</span><span class="comment">   * In the `sync_io` pattern the user&#39;s outside event loop is responsible for awaiting readability/writability</span></div>
<div class="line"><a id="l00448" name="l00448"></a><span class="lineno">  448</span><span class="comment">   * of a guy like #m_mq_ready_reader via our exporting of its `.native_handle()`.</span></div>
<div class="line"><a id="l00449" name="l00449"></a><span class="lineno">  449</span><span class="comment">   *</span></div>
<div class="line"><a id="l00450" name="l00450"></a><span class="lineno">  450</span><span class="comment">   * Never touched if Persistent_mq_handle::S_HAS_NATIVE_HANDLE.</span></div>
<div class="line"><a id="l00451" name="l00451"></a><span class="lineno">  451</span><span class="comment">   *</span></div>
<div class="line"><a id="l00452" name="l00452"></a><span class="lineno">  452</span><span class="comment">   * @todo Consider using specialization instead of or in addition `if constexpr()` w/r/t</span></div>
<div class="line"><a id="l00453" name="l00453"></a><span class="lineno">  453</span><span class="comment">   * `Mq::S_HAS_NATIVE_HANDLE`-based compile-time branching: it could save some RAM by eliminating `optional`s</span></div>
<div class="line"><a id="l00454" name="l00454"></a><span class="lineno">  454</span><span class="comment">   * such as the one near this to-do; though code would likely become wordier.</span></div>
<div class="line"><a id="l00455" name="l00455"></a><span class="lineno">  455</span><span class="comment">   */</span></div>
<div class="line"><a id="l00456" name="l00456"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a0614000879d4595c84f803ecadae708a">  456</a></span>  std::optional&lt;flow::util::Task_engine&gt; <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a0614000879d4595c84f803ecadae708a">m_nb_task_engine</a>;</div>
<div class="line"><a id="l00457" name="l00457"></a><span class="lineno">  457</span><span class="comment"></span> </div>
<div class="line"><a id="l00458" name="l00458"></a><span class="lineno">  458</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00459" name="l00459"></a><span class="lineno">  459</span><span class="comment">   * The `Task_engine` for `m_ev_wait_hndl_*`, unless it is replaced via replace_event_wait_handles().</span></div>
<div class="line"><a id="l00460" name="l00460"></a><span class="lineno">  460</span><span class="comment">   * There are 2 possibilities:</span></div>
<div class="line"><a id="l00461" name="l00461"></a><span class="lineno">  461</span><span class="comment">   *   - They leave this guy associated with `m_ev_wait_hndl_*`.  Then no one shall be doing `.async_wait()` on</span></div>
<div class="line"><a id="l00462" name="l00462"></a><span class="lineno">  462</span><span class="comment">   *     them, and instead the user aims to perhaps use raw `[e]poll*()` on their `.native_handle()`s.</span></div>
<div class="line"><a id="l00463" name="l00463"></a><span class="lineno">  463</span><span class="comment">   *     We still need some `Task_engine` to construct them though, so we use this.</span></div>
<div class="line"><a id="l00464" name="l00464"></a><span class="lineno">  464</span><span class="comment">   *   - They use replace_event_wait_handles(), and therefore this becomes dissociated with `m_ev_wait_hndl_*` and</span></div>
<div class="line"><a id="l00465" name="l00465"></a><span class="lineno">  465</span><span class="comment">   *     becomes completely unused in any fashion, period.  Then they shall probably be doing</span></div>
<div class="line"><a id="l00466" name="l00466"></a><span class="lineno">  466</span><span class="comment">   *     their own `.async_wait()` -- associated with their own `Task_engine` -- on `m_ev_wait_hndl_*`.</span></div>
<div class="line"><a id="l00467" name="l00467"></a><span class="lineno">  467</span><span class="comment">   *</span></div>
<div class="line"><a id="l00468" name="l00468"></a><span class="lineno">  468</span><span class="comment">   * This is all to fulfill the `sync_io` pattern.</span></div>
<div class="line"><a id="l00469" name="l00469"></a><span class="lineno">  469</span><span class="comment">   */</span></div>
<div class="line"><a id="l00470" name="l00470"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#abdda4c698320a44bdf479340cbed6934">  470</a></span>  flow::util::Task_engine <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#abdda4c698320a44bdf479340cbed6934">m_ev_hndl_task_engine_unused</a>;</div>
<div class="line"><a id="l00471" name="l00471"></a><span class="lineno">  471</span><span class="comment"></span> </div>
<div class="line"><a id="l00472" name="l00472"></a><span class="lineno">  472</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00473" name="l00473"></a><span class="lineno">  473</span><span class="comment">   * The MQ handle adopted by the ctor, through which nb-sends and blocking-waits are executed.</span></div>
<div class="line"><a id="l00474" name="l00474"></a><span class="lineno">  474</span><span class="comment">   * It is not directly protected by any mutex; however it is accessed exclusively as follows:</span></div>
<div class="line"><a id="l00475" name="l00475"></a><span class="lineno">  475</span><span class="comment">   *   - By thread W, when #m_pending_payloads_q has elements (would-block state), thus thread U has tasked</span></div>
<div class="line"><a id="l00476" name="l00476"></a><span class="lineno">  476</span><span class="comment">   *     it with awaiting sendability -- which it is doing and is not yet done doing.</span></div>
<div class="line"><a id="l00477" name="l00477"></a><span class="lineno">  477</span><span class="comment">   *   - By thread U, when #m_pending_payloads_q is `.empty()` (no would-block at the moment); or</span></div>
<div class="line"><a id="l00478" name="l00478"></a><span class="lineno">  478</span><span class="comment">   *     it is not .empty(), but thread W has signaled it is done awaiting non-would-block, so thread U</span></div>
<div class="line"><a id="l00479" name="l00479"></a><span class="lineno">  479</span><span class="comment">   *     is trying to empty it via nb-writes.</span></div>
<div class="line"><a id="l00480" name="l00480"></a><span class="lineno">  480</span><span class="comment">   *</span></div>
<div class="line"><a id="l00481" name="l00481"></a><span class="lineno">  481</span><span class="comment">   * Exception: `m_mq-&gt;interrupt_sends()` is done from thread U (dtor), potentially *while* thread W</span></div>
<div class="line"><a id="l00482" name="l00482"></a><span class="lineno">  482</span><span class="comment">   * is inside `m_mq-&gt;wait_sendable()`.  However that specific action is allowed by Persistent_mq_handle contract</span></div>
<div class="line"><a id="l00483" name="l00483"></a><span class="lineno">  483</span><span class="comment">   * (in fact that is the main utility of Persistent_mq_handle::interrupt_sends()).  It makes the</span></div>
<div class="line"><a id="l00484" name="l00484"></a><span class="lineno">  484</span><span class="comment">   * Persistent_mq_handle::wait_sendable() immediately return.</span></div>
<div class="line"><a id="l00485" name="l00485"></a><span class="lineno">  485</span><span class="comment">   *</span></div>
<div class="line"><a id="l00486" name="l00486"></a><span class="lineno">  486</span><span class="comment">   * If and only if #m_pending_err_code is truthy, #m_mq is null; hence the handle&#39;s system resources (and the</span></div>
<div class="line"><a id="l00487" name="l00487"></a><span class="lineno">  487</span><span class="comment">   * handle object&#39;s memory itself) are given back at the earliest possible time.</span></div>
<div class="line"><a id="l00488" name="l00488"></a><span class="lineno">  488</span><span class="comment">   */</span></div>
<div class="line"><a id="l00489" name="l00489"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a32a49dff090ce4b658707e7d9b9036c9">  489</a></span>  <span class="keyword">typename</span> <a class="code hl_typedef" href="classipc_1_1transport_1_1Blob__stream__mq__base__impl.html#aab7c4c91d42c746c93e61eb367572eb1">Base::Auto_closing_mq</a> <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a32a49dff090ce4b658707e7d9b9036c9">m_mq</a>;</div>
<div class="line"><a id="l00490" name="l00490"></a><span class="lineno">  490</span><span class="comment"></span> </div>
<div class="line"><a id="l00491" name="l00491"></a><span class="lineno">  491</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00492" name="l00492"></a><span class="lineno">  492</span><span class="comment">   * Equals `m_mq.max_msg_size()`.</span></div>
<div class="line"><a id="l00493" name="l00493"></a><span class="lineno">  493</span><span class="comment">   * ### Rationale ###</span></div>
<div class="line"><a id="l00494" name="l00494"></a><span class="lineno">  494</span><span class="comment">   * It is saved in ctor, instead of invoking `m_mq-&gt;max_msg_size()` when needed, to keep the rules for when #m_mq</span></div>
<div class="line"><a id="l00495" name="l00495"></a><span class="lineno">  495</span><span class="comment">   * is accessed simple and as described in its doc header.  After all this value would never change anyway.</span></div>
<div class="line"><a id="l00496" name="l00496"></a><span class="lineno">  496</span><span class="comment">   */</span></div>
<div class="line"><a id="l00497" name="l00497"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a3a69e00d989a53f1151c64b58560551f">  497</a></span>  <span class="keyword">const</span> <span class="keywordtype">size_t</span> <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a3a69e00d989a53f1151c64b58560551f">m_mq_max_msg_sz</a>;</div>
<div class="line"><a id="l00498" name="l00498"></a><span class="lineno">  498</span><span class="comment"></span> </div>
<div class="line"><a id="l00499" name="l00499"></a><span class="lineno">  499</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00500" name="l00500"></a><span class="lineno">  500</span><span class="comment">   * Read-end of IPC-pipe used by thread U to detect that a thread-W transmissibility-wait has completed,</span></div>
<div class="line"><a id="l00501" name="l00501"></a><span class="lineno">  501</span><span class="comment">   * meaning would-block has cleared, and therefore thread U can attempt to nb-transmit again.  The signal byte</span></div>
<div class="line"><a id="l00502" name="l00502"></a><span class="lineno">  502</span><span class="comment">   * is read out of #m_mq_ready_reader, making it empty again (the steady-state before the next time would-block</span></div>
<div class="line"><a id="l00503" name="l00503"></a><span class="lineno">  503</span><span class="comment">   * occurs, and a byte is written to it making it non-empty).</span></div>
<div class="line"><a id="l00504" name="l00504"></a><span class="lineno">  504</span><span class="comment">   *</span></div>
<div class="line"><a id="l00505" name="l00505"></a><span class="lineno">  505</span><span class="comment">   * @see #m_mq_ready_writer.</span></div>
<div class="line"><a id="l00506" name="l00506"></a><span class="lineno">  506</span><span class="comment">   *</span></div>
<div class="line"><a id="l00507" name="l00507"></a><span class="lineno">  507</span><span class="comment">   * Never touched if Persistent_mq_handle::S_HAS_NATIVE_HANDLE.</span></div>
<div class="line"><a id="l00508" name="l00508"></a><span class="lineno">  508</span><span class="comment">   */</span></div>
<div class="line"><a id="l00509" name="l00509"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a63f5f55ad38aecc5195a93bccaf23014">  509</a></span>  std::optional&lt;util::Pipe_reader&gt; <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a63f5f55ad38aecc5195a93bccaf23014">m_mq_ready_reader</a>;</div>
<div class="line"><a id="l00510" name="l00510"></a><span class="lineno">  510</span><span class="comment"></span> </div>
<div class="line"><a id="l00511" name="l00511"></a><span class="lineno">  511</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00512" name="l00512"></a><span class="lineno">  512</span><span class="comment">   * Write-end of IPC-pipe used by thread W to inform thread U that a thread-W transmissibility-wait has completed,</span></div>
<div class="line"><a id="l00513" name="l00513"></a><span class="lineno">  513</span><span class="comment">   * meaning would-block has cleared, and therefore thread U can attempt to nb-transmit again.  A signal byte</span></div>
<div class="line"><a id="l00514" name="l00514"></a><span class="lineno">  514</span><span class="comment">   * is written to #m_mq_ready_writer, making it non-empty.</span></div>
<div class="line"><a id="l00515" name="l00515"></a><span class="lineno">  515</span><span class="comment">   *</span></div>
<div class="line"><a id="l00516" name="l00516"></a><span class="lineno">  516</span><span class="comment">   * @see #m_mq_ready_reader.</span></div>
<div class="line"><a id="l00517" name="l00517"></a><span class="lineno">  517</span><span class="comment">   *</span></div>
<div class="line"><a id="l00518" name="l00518"></a><span class="lineno">  518</span><span class="comment">   * Never touched if Persistent_mq_handle::S_HAS_NATIVE_HANDLE.</span></div>
<div class="line"><a id="l00519" name="l00519"></a><span class="lineno">  519</span><span class="comment">   */</span></div>
<div class="line"><a id="l00520" name="l00520"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a72c3901ca66a8d94aa22c83118aedbdd">  520</a></span>  std::optional&lt;util::Pipe_writer&gt; <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a72c3901ca66a8d94aa22c83118aedbdd">m_mq_ready_writer</a>;</div>
<div class="line"><a id="l00521" name="l00521"></a><span class="lineno">  521</span><span class="comment"></span> </div>
<div class="line"><a id="l00522" name="l00522"></a><span class="lineno">  522</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00523" name="l00523"></a><span class="lineno">  523</span><span class="comment">   * Descriptor waitable by outside event loop async-waits -- storing the same `Native_handle` as (and thus being</span></div>
<div class="line"><a id="l00524" name="l00524"></a><span class="lineno">  524</span><span class="comment">   * used to wait on events from) #m_mq_ready_reader; or if #m_mq can be watched directly (known at compile-time)</span></div>
<div class="line"><a id="l00525" name="l00525"></a><span class="lineno">  525</span><span class="comment">   * then as `m_mq` itself.  Its name suggests it&#39;s watching #m_mq (for transmissibility),</span></div>
<div class="line"><a id="l00526" name="l00526"></a><span class="lineno">  526</span><span class="comment">   * and that&#39;s true: In the latter case one directly watches it for transmissibility in the proper direction;</span></div>
<div class="line"><a id="l00527" name="l00527"></a><span class="lineno">  527</span><span class="comment">   * in the former case Persistent_mq_handle lacks a #Native_handle to watch directly -- but we use the</span></div>
<div class="line"><a id="l00528" name="l00528"></a><span class="lineno">  528</span><span class="comment">   * `m_mq_ready_*` pipe and a background thread to simulate it having one.  Thus in that case #m_mq_ready_reader FD =</span></div>
<div class="line"><a id="l00529" name="l00529"></a><span class="lineno">  529</span><span class="comment">   * this FD, and it being transmissible = MQ being transmissible.</span></div>
<div class="line"><a id="l00530" name="l00530"></a><span class="lineno">  530</span><span class="comment">   */</span></div>
<div class="line"><a id="l00531" name="l00531"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a31580924c39d2dfe9cdfa9f7cb36ccd4">  531</a></span>  <a class="code hl_class" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html">util::sync_io::Asio_waitable_native_handle</a> <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a31580924c39d2dfe9cdfa9f7cb36ccd4">m_ev_wait_hndl_mq</a>;</div>
<div class="line"><a id="l00532" name="l00532"></a><span class="lineno">  532</span><span class="comment"></span> </div>
<div class="line"><a id="l00533" name="l00533"></a><span class="lineno">  533</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00534" name="l00534"></a><span class="lineno">  534</span><span class="comment">   * As typical in timer-needing `sync_io`-pattern-implementing objects, maintains a thread exclusively for</span></div>
<div class="line"><a id="l00535" name="l00535"></a><span class="lineno">  535</span><span class="comment">   * `Timer` wait completion handlers which ferry timer-fired events to internal IPC-mechanisms waitable</span></div>
<div class="line"><a id="l00536" name="l00536"></a><span class="lineno">  536</span><span class="comment">   * by the `sync_io`-pattern-using outside event loop.  In our case we (optionally) maintain the auto-ping timer.</span></div>
<div class="line"><a id="l00537" name="l00537"></a><span class="lineno">  537</span><span class="comment">   *</span></div>
<div class="line"><a id="l00538" name="l00538"></a><span class="lineno">  538</span><span class="comment">   * @see util::sync_io::Timer_event_emitter doc header for design/rationale discussion.</span></div>
<div class="line"><a id="l00539" name="l00539"></a><span class="lineno">  539</span><span class="comment">   */</span></div>
<div class="line"><a id="l00540" name="l00540"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ab8bae935aff314b88d6163d04f52b5eb">  540</a></span>  <a class="code hl_class" href="classipc_1_1util_1_1sync__io_1_1Timer__event__emitter.html">util::sync_io::Timer_event_emitter</a> <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ab8bae935aff314b88d6163d04f52b5eb">m_timer_worker</a>;</div>
<div class="line"><a id="l00541" name="l00541"></a><span class="lineno">  541</span><span class="comment"></span> </div>
<div class="line"><a id="l00542" name="l00542"></a><span class="lineno">  542</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00543" name="l00543"></a><span class="lineno">  543</span><span class="comment">   * Queue storing (at head) the currently in-progress async write-op of a Snd_low_lvl_payload; followed by</span></div>
<div class="line"><a id="l00544" name="l00544"></a><span class="lineno">  544</span><span class="comment">   * the payloads that should be written after that completes, in order.</span></div>
<div class="line"><a id="l00545" name="l00545"></a><span class="lineno">  545</span><span class="comment">   *</span></div>
<div class="line"><a id="l00546" name="l00546"></a><span class="lineno">  546</span><span class="comment">   * Only touched if would-block is encountered in... well, see Snd_low_lvl_payload doc header (et al).</span></div>
<div class="line"><a id="l00547" name="l00547"></a><span class="lineno">  547</span><span class="comment">   */</span></div>
<div class="line"><a id="l00548" name="l00548"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#aaecb4615ae4d9fbf82ab2c195ada47cf">  548</a></span>  std::queue&lt;typename Snd_low_lvl_payload::Ptr&gt; <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#aaecb4615ae4d9fbf82ab2c195ada47cf">m_pending_payloads_q</a>;</div>
<div class="line"><a id="l00549" name="l00549"></a><span class="lineno">  549</span><span class="comment"></span> </div>
<div class="line"><a id="l00550" name="l00550"></a><span class="lineno">  550</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00551" name="l00551"></a><span class="lineno">  551</span><span class="comment">   * The first and only connection-hosing error condition detected when attempting to low-level-write on</span></div>
<div class="line"><a id="l00552" name="l00552"></a><span class="lineno">  552</span><span class="comment">   * #m_mq; or falsy if no such error has yet been detected.  Among possible other uses, it is returned</span></div>
<div class="line"><a id="l00553" name="l00553"></a><span class="lineno">  553</span><span class="comment">   * by send_blob() and the completion handler of async_end_sending().</span></div>
<div class="line"><a id="l00554" name="l00554"></a><span class="lineno">  554</span><span class="comment">   */</span></div>
<div class="line"><a id="l00555" name="l00555"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#affd27be454f2e394f44fc76a5a4c50de">  555</a></span>  <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a> <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#affd27be454f2e394f44fc76a5a4c50de">m_pending_err_code</a>;</div>
<div class="line"><a id="l00556" name="l00556"></a><span class="lineno">  556</span><span class="comment"></span> </div>
<div class="line"><a id="l00557" name="l00557"></a><span class="lineno">  557</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00558" name="l00558"></a><span class="lineno">  558</span><span class="comment">   * `false` at start; set to `true` forever on the first `*end_sending()` invocation;</span></div>
<div class="line"><a id="l00559" name="l00559"></a><span class="lineno">  559</span><span class="comment">   * `true` will prevent any subsequent send_blob() calls from proceeding.</span></div>
<div class="line"><a id="l00560" name="l00560"></a><span class="lineno">  560</span><span class="comment">   * See class doc header impl section for design discussion.</span></div>
<div class="line"><a id="l00561" name="l00561"></a><span class="lineno">  561</span><span class="comment">   */</span></div>
<div class="line"><a id="l00562" name="l00562"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ac9712c677320d7e9d4efa83798fa8aac">  562</a></span>  <span class="keywordtype">bool</span> <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ac9712c677320d7e9d4efa83798fa8aac">m_finished</a>;</div>
<div class="line"><a id="l00563" name="l00563"></a><span class="lineno">  563</span><span class="comment"></span> </div>
<div class="line"><a id="l00564" name="l00564"></a><span class="lineno">  564</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00565" name="l00565"></a><span class="lineno">  565</span><span class="comment">   * Function passed to async_end_sending(), if it returned `true` and was unable to synchronously flush everything</span></div>
<div class="line"><a id="l00566" name="l00566"></a><span class="lineno">  566</span><span class="comment">   * including the graceful-close itself (synchronously detecting new or previous pipe-hosing error *does* entail</span></div>
<div class="line"><a id="l00567" name="l00567"></a><span class="lineno">  567</span><span class="comment">   * flushing everything); otherwise `.empty()`.  It&#39;s the completion handler of that graceful-close-send API.</span></div>
<div class="line"><a id="l00568" name="l00568"></a><span class="lineno">  568</span><span class="comment">   */</span></div>
<div class="line"><a id="l00569" name="l00569"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a48689f6fbe1a1d4df3285736326b18f4">  569</a></span>  flow::async::Task_asio_err <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a48689f6fbe1a1d4df3285736326b18f4">m_pending_on_last_send_done_func_or_empty</a>;</div>
<div class="line"><a id="l00570" name="l00570"></a><span class="lineno">  570</span><span class="comment"></span> </div>
<div class="line"><a id="l00571" name="l00571"></a><span class="lineno">  571</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00572" name="l00572"></a><span class="lineno">  572</span><span class="comment">   * Equals `zero()` before auto_ping(); immutably equals `period` (auto_ping() arg) subsequently to that first</span></div>
<div class="line"><a id="l00573" name="l00573"></a><span class="lineno">  573</span><span class="comment">   * successful call (if any).</span></div>
<div class="line"><a id="l00574" name="l00574"></a><span class="lineno">  574</span><span class="comment">   */</span></div>
<div class="line"><a id="l00575" name="l00575"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a2c8029fdae05966ef05312919c85aeac">  575</a></span>  <a class="code hl_typedef" href="namespaceipc_1_1util.html#ac66141280c3b7295a86b65209f31cc58">util::Fine_duration</a> <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a2c8029fdae05966ef05312919c85aeac">m_auto_ping_period</a>;</div>
<div class="line"><a id="l00576" name="l00576"></a><span class="lineno">  576</span><span class="comment"></span> </div>
<div class="line"><a id="l00577" name="l00577"></a><span class="lineno">  577</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00578" name="l00578"></a><span class="lineno">  578</span><span class="comment">   * Timer that fires on_ev_auto_ping_now_timer_fired() (which sends an auto-ping) and is always</span></div>
<div class="line"><a id="l00579" name="l00579"></a><span class="lineno">  579</span><span class="comment">   * scheduled to fire #m_auto_ping_period after the last send (send_blob(),  auto_ping(),</span></div>
<div class="line"><a id="l00580" name="l00580"></a><span class="lineno">  580</span><span class="comment">   * on_ev_auto_ping_now_timer_fired() itself).  Each of these calls indicates a send occurs, hence</span></div>
<div class="line"><a id="l00581" name="l00581"></a><span class="lineno">  581</span><span class="comment">   * at worst the pipe will be idle (in need of auto-ping) in #m_auto_ping_period.  Note that</span></div>
<div class="line"><a id="l00582" name="l00582"></a><span class="lineno">  582</span><span class="comment">   * `*end_sending()`, while also sending bytes, does not schedule #m_auto_ping_timer, as `*end_sending()`</span></div>
<div class="line"><a id="l00583" name="l00583"></a><span class="lineno">  583</span><span class="comment">   * closes the conceptual pipe, and there is no need for auto-pinging (see Blob_receiver::idle_timer_run()).</span></div>
<div class="line"><a id="l00584" name="l00584"></a><span class="lineno">  584</span><span class="comment">   *</span></div>
<div class="line"><a id="l00585" name="l00585"></a><span class="lineno">  585</span><span class="comment">   * Since we implement `sync_io` pattern, the timer is obtained from, and used via, util::sync_io::Timer_event_emitter</span></div>
<div class="line"><a id="l00586" name="l00586"></a><span class="lineno">  586</span><span class="comment">   * #m_timer_worker.  See that member&#39;s doc header for more info.</span></div>
<div class="line"><a id="l00587" name="l00587"></a><span class="lineno">  587</span><span class="comment">   */</span></div>
<div class="line"><a id="l00588" name="l00588"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a41bb316b2f9ca88371506ebed3890261">  588</a></span>  flow::util::Timer <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a41bb316b2f9ca88371506ebed3890261">m_auto_ping_timer</a>;</div>
<div class="line"><a id="l00589" name="l00589"></a><span class="lineno">  589</span><span class="comment"></span> </div>
<div class="line"><a id="l00590" name="l00590"></a><span class="lineno">  590</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00591" name="l00591"></a><span class="lineno">  591</span><span class="comment">   * Read-end of IPC-mechanism used by #m_timer_worker to ferry timer-fired events from #m_auto_ping_timer</span></div>
<div class="line"><a id="l00592" name="l00592"></a><span class="lineno">  592</span><span class="comment">   * to `sync_io` outside async-wait to our actual on-timer-fired handler logic.</span></div>
<div class="line"><a id="l00593" name="l00593"></a><span class="lineno">  593</span><span class="comment">   *</span></div>
<div class="line"><a id="l00594" name="l00594"></a><span class="lineno">  594</span><span class="comment">   * @see #m_timer_worker for more info.</span></div>
<div class="line"><a id="l00595" name="l00595"></a><span class="lineno">  595</span><span class="comment">   */</span></div>
<div class="line"><a id="l00596" name="l00596"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ac4bd1d018000ca258478b62cf67cc524">  596</a></span>  <a class="code hl_typedef" href="classipc_1_1util_1_1sync__io_1_1Timer__event__emitter.html#a1533a54927a64579fda02c61ec94b735">util::sync_io::Timer_event_emitter::Timer_fired_read_end</a>* <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ac4bd1d018000ca258478b62cf67cc524">m_auto_ping_timer_fired_peer</a>;</div>
<div class="line"><a id="l00597" name="l00597"></a><span class="lineno">  597</span><span class="comment"></span> </div>
<div class="line"><a id="l00598" name="l00598"></a><span class="lineno">  598</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00599" name="l00599"></a><span class="lineno">  599</span><span class="comment">   * Descriptor waitable by outside event loop async-waits -- storing the same `Native_handle` as (and thus being</span></div>
<div class="line"><a id="l00600" name="l00600"></a><span class="lineno">  600</span><span class="comment">   * used to wait on events from) #m_auto_ping_timer_fired_peer.</span></div>
<div class="line"><a id="l00601" name="l00601"></a><span class="lineno">  601</span><span class="comment">   *</span></div>
<div class="line"><a id="l00602" name="l00602"></a><span class="lineno">  602</span><span class="comment">   * @see #m_timer_worker for more info.</span></div>
<div class="line"><a id="l00603" name="l00603"></a><span class="lineno">  603</span><span class="comment">   */</span></div>
<div class="line"><a id="l00604" name="l00604"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a50bf9bbbf413b27e6189aa4d393b9dd7">  604</a></span>  <a class="code hl_class" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html">util::sync_io::Asio_waitable_native_handle</a> <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a50bf9bbbf413b27e6189aa4d393b9dd7">m_ev_wait_hndl_auto_ping_timer_fired_peer</a>;</div>
<div class="line"><a id="l00605" name="l00605"></a><span class="lineno">  605</span><span class="comment"></span> </div>
<div class="line"><a id="l00606" name="l00606"></a><span class="lineno">  606</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00607" name="l00607"></a><span class="lineno">  607</span><span class="comment">   * Function (set forever in start_send_blob_ops()) through which we invoke the outside event loop&#39;s</span></div>
<div class="line"><a id="l00608" name="l00608"></a><span class="lineno">  608</span><span class="comment">   * async-wait facility for descriptors/events to our ops.  See util::sync_io::Event_wait_func</span></div>
<div class="line"><a id="l00609" name="l00609"></a><span class="lineno">  609</span><span class="comment">   * doc header for a refresher on this mechanic.</span></div>
<div class="line"><a id="l00610" name="l00610"></a><span class="lineno">  610</span><span class="comment">   */</span></div>
<div class="line"><a id="l00611" name="l00611"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a9dca3046bc4d15657c08ac1c06f3b36d">  611</a></span>  <a class="code hl_typedef" href="namespaceipc_1_1util_1_1sync__io.html#aa0b9a3cc6bdc7dedbef4f9e06851aa24">util::sync_io::Event_wait_func</a> <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a9dca3046bc4d15657c08ac1c06f3b36d">m_ev_wait_func</a>;</div>
<div class="line"><a id="l00612" name="l00612"></a><span class="lineno">  612</span><span class="comment"></span> </div>
<div class="line"><a id="l00613" name="l00613"></a><span class="lineno">  613</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00614" name="l00614"></a><span class="lineno">  614</span><span class="comment">   * Worker thread W always in one of 2 states: idle; or (when #m_mq is in would-block condition) executing an</span></div>
<div class="line"><a id="l00615" name="l00615"></a><span class="lineno">  615</span><span class="comment">   * indefinite, interrupting blocking wait for transmissibility of #m_mq.  When thread U wants to send-out</span></div>
<div class="line"><a id="l00616" name="l00616"></a><span class="lineno">  616</span><span class="comment">   * a payload but gets would-block, it issues the wait on this thread W and a `sync_io`-pattern async-wait</span></div>
<div class="line"><a id="l00617" name="l00617"></a><span class="lineno">  617</span><span class="comment">   * for #m_ev_wait_hndl_mq; once that wait completes in thread W, it writes a byte to an internal IPC-pipe.</span></div>
<div class="line"><a id="l00618" name="l00618"></a><span class="lineno">  618</span><span class="comment">   * #m_ev_wait_hndl_mq becomes readable, the outside event loop lets `*this` know, which completes the async-wait.</span></div>
<div class="line"><a id="l00619" name="l00619"></a><span class="lineno">  619</span><span class="comment">   *</span></div>
<div class="line"><a id="l00620" name="l00620"></a><span class="lineno">  620</span><span class="comment">   * In dtor we stop thread W, including using Persistent_mq_handle::interrupt_sends() to abort the indefinite</span></div>
<div class="line"><a id="l00621" name="l00621"></a><span class="lineno">  621</span><span class="comment">   * wait in thread W, as it will no longer be used once `*this` is destroyed.</span></div>
<div class="line"><a id="l00622" name="l00622"></a><span class="lineno">  622</span><span class="comment">   *</span></div>
<div class="line"><a id="l00623" name="l00623"></a><span class="lineno">  623</span><span class="comment">   * Ordering: If we want to let things get auto-destroyed without explicit `m_blocking_worker-&gt;stop()` or</span></div>
<div class="line"><a id="l00624" name="l00624"></a><span class="lineno">  624</span><span class="comment">   * nullifying wrappers in an explicit order, then this must be declared after #m_mq.  Otherwise code may still be</span></div>
<div class="line"><a id="l00625" name="l00625"></a><span class="lineno">  625</span><span class="comment">   * finishing up in thread W when #m_mq is destroyed already.  Anyway -- as long as this is destroyed or `.stop()`ed</span></div>
<div class="line"><a id="l00626" name="l00626"></a><span class="lineno">  626</span><span class="comment">   * before #m_mq is gone, you&#39;re cool.</span></div>
<div class="line"><a id="l00627" name="l00627"></a><span class="lineno">  627</span><span class="comment">   *</span></div>
<div class="line"><a id="l00628" name="l00628"></a><span class="lineno">  628</span><span class="comment">   * Never touched if Persistent_mq_handle::S_HAS_NATIVE_HANDLE.</span></div>
<div class="line"><a id="l00629" name="l00629"></a><span class="lineno">  629</span><span class="comment">   */</span></div>
<div class="line"><a id="l00630" name="l00630"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a33709386e4339aae663702488cbfe5c7">  630</a></span>  std::optional&lt;flow::async::Single_thread_task_loop&gt; <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a33709386e4339aae663702488cbfe5c7">m_blocking_worker</a>;</div>
<div class="line"><a id="l00631" name="l00631"></a><span class="lineno">  631</span>}; <span class="comment">// class Blob_stream_mq_sender</span></div>
<div class="line"><a id="l00632" name="l00632"></a><span class="lineno">  632</span> </div>
<div class="line"><a id="l00633" name="l00633"></a><span class="lineno">  633</span><span class="comment">// Free functions: in *_fwd.hpp.</span></div>
<div class="line"><a id="l00634" name="l00634"></a><span class="lineno">  634</span> </div>
<div class="line"><a id="l00635" name="l00635"></a><span class="lineno">  635</span><span class="comment">// Template implementations.</span></div>
<div class="line"><a id="l00636" name="l00636"></a><span class="lineno">  636</span> </div>
<div class="line"><a id="l00637" name="l00637"></a><span class="lineno">  637</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Persistent_mq_handle&gt;</div>
<div class="line"><a id="l00638" name="l00638"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a71caa7f5002886b2c0717645945d7144">  638</a></span><a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a71caa7f5002886b2c0717645945d7144">Blob_stream_mq_sender_impl&lt;Persistent_mq_handle&gt;::Blob_stream_mq_sender_impl</a></div>
<div class="line"><a id="l00639" name="l00639"></a><span class="lineno">  639</span>  (flow::log::Logger* logger_ptr, <a class="code hl_typedef" href="namespaceipc_1_1util.html#ae6ac47812a90d1287c61e0b7de7bc4f5">util::String_view</a> nickname_str, <a class="code hl_class" href="classipc_1_1transport_1_1Persistent__mq__handle.html">Mq</a>&amp;&amp; mq,</div>
<div class="line"><a id="l00640" name="l00640"></a><span class="lineno">  640</span>   <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>* err_code) :</div>
<div class="line"><a id="l00641" name="l00641"></a><span class="lineno">  641</span> </div>
<div class="line"><a id="l00642" name="l00642"></a><span class="lineno">  642</span>  flow::log::Log_context(logger_ptr, <a class="code hl_enumeration" href="namespaceipc.html#a4ccdeed058222c635745a4dc830e99f7">Log_component</a>::S_TRANSPORT),</div>
<div class="line"><a id="l00643" name="l00643"></a><span class="lineno">  643</span>  m_nickname(nickname_str),</div>
<div class="line"><a id="l00644" name="l00644"></a><span class="lineno">  644</span>  m_protocol_negotiator(get_logger(), nickname(),</div>
<div class="line"><a id="l00645" name="l00645"></a><span class="lineno">  645</span>                        1, 1), <span class="comment">// Initial protocol!  @todo Magic-number `const`(s), particularly if/when v2 exists.</span></div>
<div class="line"><a id="l00646" name="l00646"></a><span class="lineno">  646</span>  m_absolute_name(mq.absolute_name()),</div>
<div class="line"><a id="l00647" name="l00647"></a><span class="lineno">  647</span>  <span class="comment">// m_mq null for now but is set up below.</span></div>
<div class="line"><a id="l00648" name="l00648"></a><span class="lineno">  648</span>  m_mq_max_msg_sz(mq.max_msg_size()), <span class="comment">// Just grab this now though.</span></div>
<div class="line"><a id="l00649" name="l00649"></a><span class="lineno">  649</span>  m_ev_wait_hndl_mq(m_ev_hndl_task_engine_unused), <span class="comment">// This needs to be .assign()ed still.</span></div>
<div class="line"><a id="l00650" name="l00650"></a><span class="lineno">  650</span>  m_timer_worker(get_logger(), flow::util::ostream_op_string(*this)),</div>
<div class="line"><a id="l00651" name="l00651"></a><span class="lineno">  651</span>  m_finished(false),</div>
<div class="line"><a id="l00652" name="l00652"></a><span class="lineno">  652</span>  m_auto_ping_period(util::<a class="code hl_typedef" href="namespaceipc_1_1util.html#ac66141280c3b7295a86b65209f31cc58">Fine_duration</a>::zero()), <span class="comment">// auto_ping() not yet called.</span></div>
<div class="line"><a id="l00653" name="l00653"></a><span class="lineno">  653</span>  m_auto_ping_timer(m_timer_worker.create_timer()), <span class="comment">// Inactive timer (auto_ping() not yet called).</span></div>
<div class="line"><a id="l00654" name="l00654"></a><span class="lineno">  654</span>  <span class="comment">/* If it does become active, we&#39;ll use this readable-pipe-peer to get informed by m_timer_worker that</span></div>
<div class="line"><a id="l00655" name="l00655"></a><span class="lineno">  655</span><span class="comment">   * m_auto_ping_timer has fired.  That way we can use m_ev_wait_func() mechanism to have user</span></div>
<div class="line"><a id="l00656" name="l00656"></a><span class="lineno">  656</span><span class="comment">   * ferry timer firings to us. */</span></div>
<div class="line"><a id="l00657" name="l00657"></a><span class="lineno">  657</span>  m_auto_ping_timer_fired_peer(m_timer_worker.create_timer_signal_pipe()),</div>
<div class="line"><a id="l00658" name="l00658"></a><span class="lineno">  658</span>  <span class="comment">// And this is its watchee mirror for outside event loop (sync_io pattern).</span></div>
<div class="line"><a id="l00659" name="l00659"></a><span class="lineno">  659</span>  m_ev_wait_hndl_auto_ping_timer_fired_peer</div>
<div class="line"><a id="l00660" name="l00660"></a><span class="lineno">  660</span>    (m_ev_hndl_task_engine_unused,</div>
<div class="line"><a id="l00661" name="l00661"></a><span class="lineno">  661</span>     <a class="code hl_struct" href="structipc_1_1util_1_1Native__handle.html">Native_handle</a>(m_auto_ping_timer_fired_peer-&gt;native_handle()))</div>
<div class="line"><a id="l00662" name="l00662"></a><span class="lineno">  662</span>{</div>
<div class="line"><a id="l00663" name="l00663"></a><span class="lineno">  663</span>  <span class="keyword">using </span>flow::error::Runtime_error;</div>
<div class="line"><a id="l00664" name="l00664"></a><span class="lineno">  664</span>  <span class="keyword">using </span>flow::util::ostream_op_string;</div>
<div class="line"><a id="l00665" name="l00665"></a><span class="lineno">  665</span>  <span class="keyword">using </span>boost::asio::connect_pipe;</div>
<div class="line"><a id="l00666" name="l00666"></a><span class="lineno">  666</span> </div>
<div class="line"><a id="l00667" name="l00667"></a><span class="lineno">  667</span>  <span class="keyword">auto</span>&amp; sys_err_code = <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#affd27be454f2e394f44fc76a5a4c50de">m_pending_err_code</a>;</div>
<div class="line"><a id="l00668" name="l00668"></a><span class="lineno">  668</span> </div>
<div class="line"><a id="l00669" name="l00669"></a><span class="lineno">  669</span>  <span class="comment">/* Read class doc header (particularly regarding lifetimes of things); then return here.  Summarizing:</span></div>
<div class="line"><a id="l00670" name="l00670"></a><span class="lineno">  670</span><span class="comment">   *</span></div>
<div class="line"><a id="l00671" name="l00671"></a><span class="lineno">  671</span><span class="comment">   * We&#39;ve promised to enforce certain semantics, namely that a given MQ can be accessed, ever, by</span></div>
<div class="line"><a id="l00672" name="l00672"></a><span class="lineno">  672</span><span class="comment">   * at most 1 Blob_stream_mq_sender (and 1 _receiver) -- across all processes, not just this one.</span></div>
<div class="line"><a id="l00673" name="l00673"></a><span class="lineno">  673</span><span class="comment">   * All that is involved in setting up m_mq (which is null at the moment) and related/derived items</span></div>
<div class="line"><a id="l00674" name="l00674"></a><span class="lineno">  674</span><span class="comment">   * mentioned as not-yet-set-up above. */</span></div>
<div class="line"><a id="l00675" name="l00675"></a><span class="lineno">  675</span>  <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a32a49dff090ce4b658707e7d9b9036c9">m_mq</a> = <a class="code hl_function" href="classipc_1_1transport_1_1Blob__stream__mq__base__impl.html#a4776b5f569ccac03eccb3fc2f360fcc9">Base::ensure_unique_peer</a>(get_logger(),</div>
<div class="line"><a id="l00676" name="l00676"></a><span class="lineno">  676</span>                                  std::move(mq), <span class="keyword">true</span> <span class="comment">/* sender */</span>, &amp;sys_err_code); <span class="comment">// Does not throw.</span></div>
<div class="line"><a id="l00677" name="l00677"></a><span class="lineno">  677</span>  assert(<span class="keywordtype">bool</span>(<a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a32a49dff090ce4b658707e7d9b9036c9">m_mq</a>) == (!sys_err_code));</div>
<div class="line"><a id="l00678" name="l00678"></a><span class="lineno">  678</span>  <span class="comment">// On error *err_code will be truthy, and it will have returned null.</span></div>
<div class="line"><a id="l00679" name="l00679"></a><span class="lineno">  679</span> </div>
<div class="line"><a id="l00680" name="l00680"></a><span class="lineno">  680</span>  <span class="comment">/* Home free w/r/t m_mq.  No longer need to worry about anything but *this and other-side single _receiver.</span></div>
<div class="line"><a id="l00681" name="l00681"></a><span class="lineno">  681</span><span class="comment">   * Not even dtor has to worry (due to that deleter up there). */</span></div>
<div class="line"><a id="l00682" name="l00682"></a><span class="lineno">  682</span> </div>
<div class="line"><a id="l00683" name="l00683"></a><span class="lineno">  683</span>  <span class="keywordflow">if</span> (!sys_err_code)</div>
<div class="line"><a id="l00684" name="l00684"></a><span class="lineno">  684</span>  {</div>
<div class="line"><a id="l00685" name="l00685"></a><span class="lineno">  685</span>    <span class="comment">/* So that leaves the setup of, ultimately, m_ev_wait_hndl_mq -- which outside event loop, via sync_io pattern,</span></div>
<div class="line"><a id="l00686" name="l00686"></a><span class="lineno">  686</span><span class="comment">     * will async-wait-on for us to detect m_mq transmissibility.  As noted in some data member doc headers, et al,</span></div>
<div class="line"><a id="l00687" name="l00687"></a><span class="lineno">  687</span><span class="comment">     * we can&#39;t watch m_mq through an FD directly; but we can simulate it by running the waits in thread W</span></div>
<div class="line"><a id="l00688" name="l00688"></a><span class="lineno">  688</span><span class="comment">     * (which is why it exists) and then simulate the active FD using a pipe whose read end m_mq_ready_reader</span></div>
<div class="line"><a id="l00689" name="l00689"></a><span class="lineno">  689</span><span class="comment">     * exports the sync_io-watched FD.</span></div>
<div class="line"><a id="l00690" name="l00690"></a><span class="lineno">  690</span><span class="comment">     *</span></div>
<div class="line"><a id="l00691" name="l00691"></a><span class="lineno">  691</span><span class="comment">     * However!  Delightfully if the particular Mq has Mq::native_handle(), then we *can* watch m_mq</span></div>
<div class="line"><a id="l00692" name="l00692"></a><span class="lineno">  692</span><span class="comment">     * through an FD.  This is known at compile-time, so in that case we can skip the above stuff entirely. */</span></div>
<div class="line"><a id="l00693" name="l00693"></a><span class="lineno">  693</span>    <span class="keywordflow">if</span> <span class="keyword">constexpr</span>(Mq::S_HAS_NATIVE_HANDLE)</div>
<div class="line"><a id="l00694" name="l00694"></a><span class="lineno">  694</span>    {</div>
<div class="line"><a id="l00695" name="l00695"></a><span class="lineno">  695</span>      <span class="comment">// Load up the FD into the watchee mirror.  See also replace_event_wait_handles().</span></div>
<div class="line"><a id="l00696" name="l00696"></a><span class="lineno">  696</span>      <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a31580924c39d2dfe9cdfa9f7cb36ccd4">m_ev_wait_hndl_mq</a>.<a class="code hl_function" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#a7d28277f9ef090032b0483c65f79f23c">assign</a>(<a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a32a49dff090ce4b658707e7d9b9036c9">m_mq</a>-&gt;native_handle());</div>
<div class="line"><a id="l00697" name="l00697"></a><span class="lineno">  697</span>    } <span class="comment">// if constexpr(Mq::S_HAS_NATIVE_HANDLE)</span></div>
<div class="line"><a id="l00698" name="l00698"></a><span class="lineno">  698</span>    <span class="keywordflow">else</span> <span class="comment">// if constexpr(!Mq::S_HAS_NATIVE_HANDLE)</span></div>
<div class="line"><a id="l00699" name="l00699"></a><span class="lineno">  699</span>    {</div>
<div class="line"><a id="l00700" name="l00700"></a><span class="lineno">  700</span>      <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a0614000879d4595c84f803ecadae708a">m_nb_task_engine</a>.emplace();</div>
<div class="line"><a id="l00701" name="l00701"></a><span class="lineno">  701</span>      <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a63f5f55ad38aecc5195a93bccaf23014">m_mq_ready_reader</a>.emplace(*<a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a0614000879d4595c84f803ecadae708a">m_nb_task_engine</a>); <span class="comment">// No handle inside but will be set-up soon below.</span></div>
<div class="line"><a id="l00702" name="l00702"></a><span class="lineno">  702</span>      <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a72c3901ca66a8d94aa22c83118aedbdd">m_mq_ready_writer</a>.emplace(*<a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a0614000879d4595c84f803ecadae708a">m_nb_task_engine</a>); <span class="comment">// Ditto.</span></div>
<div class="line"><a id="l00703" name="l00703"></a><span class="lineno">  703</span> </div>
<div class="line"><a id="l00704" name="l00704"></a><span class="lineno">  704</span>      <span class="comment">// Start thread W, for when we (and if) we need to use it to async-wait for transmissibility.</span></div>
<div class="line"><a id="l00705" name="l00705"></a><span class="lineno">  705</span>      <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a33709386e4339aae663702488cbfe5c7">m_blocking_worker</a>.emplace(get_logger(),</div>
<div class="line"><a id="l00706" name="l00706"></a><span class="lineno">  706</span>                                ostream_op_string(<span class="stringliteral">&quot;mq_snd-&quot;</span>, <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ad30ee34fd91e68a084d207763e753f6d">nickname</a>())); <span class="comment">// Thread W started just below.</span></div>
<div class="line"><a id="l00707" name="l00707"></a><span class="lineno">  707</span>      <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a33709386e4339aae663702488cbfe5c7">m_blocking_worker</a>-&gt;start();</div>
<div class="line"><a id="l00708" name="l00708"></a><span class="lineno">  708</span> </div>
<div class="line"><a id="l00709" name="l00709"></a><span class="lineno">  709</span>      <span class="comment">// For now we just set up the IPC-pipe and the sync_io-watched FD mirror.  First things first... err, second....</span></div>
<div class="line"><a id="l00710" name="l00710"></a><span class="lineno">  710</span>      connect_pipe(*<a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a63f5f55ad38aecc5195a93bccaf23014">m_mq_ready_reader</a>, *<a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a72c3901ca66a8d94aa22c83118aedbdd">m_mq_ready_writer</a>, sys_err_code);</div>
<div class="line"><a id="l00711" name="l00711"></a><span class="lineno">  711</span>      <span class="keywordflow">if</span> (sys_err_code)</div>
<div class="line"><a id="l00712" name="l00712"></a><span class="lineno">  712</span>      {</div>
<div class="line"><a id="l00713" name="l00713"></a><span class="lineno">  713</span>        FLOW_LOG_WARNING</div>
<div class="line"><a id="l00714" name="l00714"></a><span class="lineno">  714</span>          (<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Constructing: connect-pipe failed.  Details follow.&quot;</span>);</div>
<div class="line"><a id="l00715" name="l00715"></a><span class="lineno">  715</span>        FLOW_ERROR_SYS_ERROR_LOG_WARNING();</div>
<div class="line"><a id="l00716" name="l00716"></a><span class="lineno">  716</span> </div>
<div class="line"><a id="l00717" name="l00717"></a><span class="lineno">  717</span>        <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a32a49dff090ce4b658707e7d9b9036c9">m_mq</a>.reset(); <span class="comment">// Undo this.</span></div>
<div class="line"><a id="l00718" name="l00718"></a><span class="lineno">  718</span>      }</div>
<div class="line"><a id="l00719" name="l00719"></a><span class="lineno">  719</span>      <span class="keywordflow">else</span></div>
<div class="line"><a id="l00720" name="l00720"></a><span class="lineno">  720</span>      {</div>
<div class="line"><a id="l00721" name="l00721"></a><span class="lineno">  721</span>        <span class="comment">// Lastly load up the read-end FD into the watchee mirror.  See also replace_event_wait_handles().</span></div>
<div class="line"><a id="l00722" name="l00722"></a><span class="lineno">  722</span>        <a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a31580924c39d2dfe9cdfa9f7cb36ccd4">m_ev_wait_hndl_mq</a>.<a class="code hl_function" href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#a7d28277f9ef090032b0483c65f79f23c">assign</a>(<a class="code hl_typedef" href="namespaceipc_1_1transport.html#a7ee4551983d9df16ec16a3139bac50e8">Native_handle</a>(<a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a63f5f55ad38aecc5195a93bccaf23014">m_mq_ready_reader</a>-&gt;native_handle()));</div>
<div class="line"><a id="l00723" name="l00723"></a><span class="lineno">  723</span>      }</div>
<div class="line"><a id="l00724" name="l00724"></a><span class="lineno">  724</span>    } <span class="comment">// if constexpr(!Mq::S_HAS_NATIVE_HANDLE)</span></div>
<div class="line"><a id="l00725" name="l00725"></a><span class="lineno">  725</span>  } <span class="comment">// if (!sys_err_code) (but it may have become truthy inside)</span></div>
<div class="line"><a id="l00726" name="l00726"></a><span class="lineno">  726</span> </div>
<div class="line"><a id="l00727" name="l00727"></a><span class="lineno">  727</span>  assert(<span class="keywordtype">bool</span>(<a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a32a49dff090ce4b658707e7d9b9036c9">m_mq</a>) == (!sys_err_code));</div>
<div class="line"><a id="l00728" name="l00728"></a><span class="lineno">  728</span> </div>
<div class="line"><a id="l00729" name="l00729"></a><span class="lineno">  729</span>  <span class="keywordflow">if</span> (!<a class="code hl_variable" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a32a49dff090ce4b658707e7d9b9036c9">m_mq</a>)</div>
<div class="line"><a id="l00730" name="l00730"></a><span class="lineno">  730</span>  {</div>
<div class="line"><a id="l00731" name="l00731"></a><span class="lineno">  731</span>    <span class="comment">// `mq` is untouched.  m_pending_err_code will cause that to be emitted on send_blob() and such.</span></div>
<div class="line"><a id="l00732" name="l00732"></a><span class="lineno">  732</span>    assert(sys_err_code);</div>
<div class="line"><a id="l00733" name="l00733"></a><span class="lineno">  733</span> </div>
<div class="line"><a id="l00734" name="l00734"></a><span class="lineno">  734</span>    <span class="keywordflow">if</span> (err_code)</div>
<div class="line"><a id="l00735" name="l00735"></a><span class="lineno">  735</span>    {</div>
<div class="line"><a id="l00736" name="l00736"></a><span class="lineno">  736</span>      *err_code = sys_err_code;</div>
<div class="line"><a id="l00737" name="l00737"></a><span class="lineno">  737</span>      <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l00738" name="l00738"></a><span class="lineno">  738</span>    }</div>
<div class="line"><a id="l00739" name="l00739"></a><span class="lineno">  739</span>    <span class="comment">// else</span></div>
<div class="line"><a id="l00740" name="l00740"></a><span class="lineno">  740</span>    <span class="keywordflow">throw</span> Runtime_error(sys_err_code, <span class="stringliteral">&quot;Blob_stream_mq_sender(): ensure_unique_peer()&quot;</span>);</div>
<div class="line"><a id="l00741" name="l00741"></a><span class="lineno">  741</span>  }</div>
<div class="line"><a id="l00742" name="l00742"></a><span class="lineno">  742</span>  <span class="comment">// else: took over `mq` ownership.</span></div>
<div class="line"><a id="l00743" name="l00743"></a><span class="lineno">  743</span>  assert(!sys_err_code);</div>
<div class="line"><a id="l00744" name="l00744"></a><span class="lineno">  744</span> </div>
<div class="line"><a id="l00745" name="l00745"></a><span class="lineno">  745</span>  FLOW_LOG_INFO(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: MQ-handle-watching apparatus ready including running &quot;</span></div>
<div class="line"><a id="l00746" name="l00746"></a><span class="lineno">  746</span>                <span class="stringliteral">&quot;blocking worker thread for would-block situations if necessary &quot;</span></div>
<div class="line"><a id="l00747" name="l00747"></a><span class="lineno">  747</span>                <span class="stringliteral">&quot;(is it? = [&quot;</span> &lt;&lt; (!Mq::S_HAS_NATIVE_HANDLE) &lt;&lt; <span class="stringliteral">&quot;]).&quot;</span>);</div>
<div class="line"><a id="l00748" name="l00748"></a><span class="lineno">  748</span>} <span class="comment">// Blob_stream_mq_sender_impl::Blob_stream_mq_sender()</span></div>
<div class="line"><a id="l00749" name="l00749"></a><span class="lineno">  749</span> </div>
<div class="line"><a id="l00750" name="l00750"></a><span class="lineno">  750</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Persistent_mq_handle&gt;</div>
<div class="line"><a id="l00751" name="l00751"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#afe0b25b57614615d0672c40cf8f58170">  751</a></span><a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#afe0b25b57614615d0672c40cf8f58170">Blob_stream_mq_sender_impl&lt;Persistent_mq_handle&gt;::~Blob_stream_mq_sender_impl</a>()</div>
<div class="line"><a id="l00752" name="l00752"></a><span class="lineno">  752</span>{</div>
<div class="line"><a id="l00753" name="l00753"></a><span class="lineno">  753</span>  <span class="keywordflow">if</span> <span class="keyword">constexpr</span>(!Mq::S_HAS_NATIVE_HANDLE)</div>
<div class="line"><a id="l00754" name="l00754"></a><span class="lineno">  754</span>  {</div>
<div class="line"><a id="l00755" name="l00755"></a><span class="lineno">  755</span>    FLOW_LOG_INFO(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Shutting down.  &quot;</span></div>
<div class="line"><a id="l00756" name="l00756"></a><span class="lineno">  756</span>                  <span class="stringliteral">&quot;Async-wait worker thread and timer thread will shut down/be joined shortly; but &quot;</span></div>
<div class="line"><a id="l00757" name="l00757"></a><span class="lineno">  757</span>                  <span class="stringliteral">&quot;we must interrupt any currently-running async-wait to ensure &quot;</span></div>
<div class="line"><a id="l00758" name="l00758"></a><span class="lineno">  758</span>                  <span class="stringliteral">&quot;async-wait worker thread actually exits.&quot;</span>);</div>
<div class="line"><a id="l00759" name="l00759"></a><span class="lineno">  759</span> </div>
<div class="line"><a id="l00760" name="l00760"></a><span class="lineno">  760</span>    <span class="comment">/* No-op if no send is pending; but it&#39;d be boring worrying about checking m_pending_payloads_q.empty() just</span></div>
<div class="line"><a id="l00761" name="l00761"></a><span class="lineno">  761</span><span class="comment">     * to avoid a no-op.  It&#39;s harmless (not *exactly* a no-op, but m_mq is not long for this world -- so who cares</span></div>
<div class="line"><a id="l00762" name="l00762"></a><span class="lineno">  762</span><span class="comment">     * if it dies while in interrupted-sends mode or otherwise?). */</span></div>
<div class="line"><a id="l00763" name="l00763"></a><span class="lineno">  763</span> </div>
<div class="line"><a id="l00764" name="l00764"></a><span class="lineno">  764</span>    <span class="keywordflow">if</span> (m_mq)</div>
<div class="line"><a id="l00765" name="l00765"></a><span class="lineno">  765</span>    {</div>
<div class="line"><a id="l00766" name="l00766"></a><span class="lineno">  766</span>      m_mq-&gt;interrupt_sends();</div>
<div class="line"><a id="l00767" name="l00767"></a><span class="lineno">  767</span>    }</div>
<div class="line"><a id="l00768" name="l00768"></a><span class="lineno">  768</span> </div>
<div class="line"><a id="l00769" name="l00769"></a><span class="lineno">  769</span>    <span class="comment">/* That&#39;s it: If there was a (blocking) task on m_blocking_worker, then it has or will have stopped soon;</span></div>
<div class="line"><a id="l00770" name="l00770"></a><span class="lineno">  770</span><span class="comment">     * the m_timer_worker thread, at worst, might harmlessly fire auto-ping timer and signal that pipe -- which</span></div>
<div class="line"><a id="l00771" name="l00771"></a><span class="lineno">  771</span><span class="comment">     * we won&#39;t check or do anything about.  Now m_blocking_worker and m_timer_worker dtors will run in opposite</span></div>
<div class="line"><a id="l00772" name="l00772"></a><span class="lineno">  772</span><span class="comment">     * order, ending/joining those threads, and then this dtor will return.  Oh, and then m_mq is safely destroyed</span></div>
<div class="line"><a id="l00773" name="l00773"></a><span class="lineno">  773</span><span class="comment">     * too. */</span></div>
<div class="line"><a id="l00774" name="l00774"></a><span class="lineno">  774</span>  } <span class="comment">// if constexpr(!Mq::S_HAS_NATIVE_HANDLE)</span></div>
<div class="line"><a id="l00775" name="l00775"></a><span class="lineno">  775</span>} <span class="comment">// Blob_stream_mq_sender_impl::~Blob_stream_mq_sender_impl()</span></div>
<div class="line"><a id="l00776" name="l00776"></a><span class="lineno">  776</span> </div>
<div class="line"><a id="l00777" name="l00777"></a><span class="lineno">  777</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Persistent_mq_handle&gt;</div>
<div class="line"><a id="l00778" name="l00778"></a><span class="lineno">  778</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Create_ev_wait_hndl_func&gt;</div>
<div class="line"><a id="l00779" name="l00779"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#aa16854340cdf194120efd08f711c74f9">  779</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#aa16854340cdf194120efd08f711c74f9">Blob_stream_mq_sender_impl&lt;Persistent_mq_handle&gt;::replace_event_wait_handles</a></div>
<div class="line"><a id="l00780" name="l00780"></a><span class="lineno">  780</span>       (<span class="keyword">const</span> Create_ev_wait_hndl_func&amp; create_ev_wait_hndl_func)</div>
<div class="line"><a id="l00781" name="l00781"></a><span class="lineno">  781</span>{</div>
<div class="line"><a id="l00782" name="l00782"></a><span class="lineno">  782</span>  <span class="keywordflow">if</span> (!m_ev_wait_func.empty())</div>
<div class="line"><a id="l00783" name="l00783"></a><span class="lineno">  783</span>  {</div>
<div class="line"><a id="l00784" name="l00784"></a><span class="lineno">  784</span>    FLOW_LOG_WARNING(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Cannot replace event-wait handles after &quot;</span></div>
<div class="line"><a id="l00785" name="l00785"></a><span class="lineno">  785</span>                     <span class="stringliteral">&quot;a start-*-ops procedure has been executed.  Ignoring.&quot;</span>);</div>
<div class="line"><a id="l00786" name="l00786"></a><span class="lineno">  786</span>    <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a id="l00787" name="l00787"></a><span class="lineno">  787</span>  }</div>
<div class="line"><a id="l00788" name="l00788"></a><span class="lineno">  788</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l00789" name="l00789"></a><span class="lineno">  789</span> </div>
<div class="line"><a id="l00790" name="l00790"></a><span class="lineno">  790</span>  <span class="keywordflow">if</span> (m_pending_err_code)</div>
<div class="line"><a id="l00791" name="l00791"></a><span class="lineno">  791</span>  {</div>
<div class="line"><a id="l00792" name="l00792"></a><span class="lineno">  792</span>    <span class="comment">/* Ctor failed (without throwing, meaning they used the non-null-err_code semantic).</span></div>
<div class="line"><a id="l00793" name="l00793"></a><span class="lineno">  793</span><span class="comment">     * It is tempting to `return false` here, but that complicates our contract and breaks the concept contract</span></div>
<div class="line"><a id="l00794" name="l00794"></a><span class="lineno">  794</span><span class="comment">     * for our method.  Actually, *this will work &quot;fine&quot;: it&#39;ll report m_pending_err_code if you try any transmission;</span></div>
<div class="line"><a id="l00795" name="l00795"></a><span class="lineno">  795</span><span class="comment">     * it won&#39;t trigger any async-waits -- so the below not running does not matter.  So it is enough to WARN</span></div>
<div class="line"><a id="l00796" name="l00796"></a><span class="lineno">  796</span><span class="comment">     * but carry on. */</span></div>
<div class="line"><a id="l00797" name="l00797"></a><span class="lineno">  797</span>    FLOW_LOG_WARNING(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Cannot replace event-wait handles as requested: &quot;</span></div>
<div class="line"><a id="l00798" name="l00798"></a><span class="lineno">  798</span>                     <span class="stringliteral">&quot;ctor failed earlier ([&quot;</span> &lt;&lt; m_pending_err_code &lt;&lt; <span class="stringliteral">&quot;] [&quot;</span> &lt;&lt; m_pending_err_code.message() &lt;&lt; <span class="stringliteral">&quot;].  &quot;</span></div>
<div class="line"><a id="l00799" name="l00799"></a><span class="lineno">  799</span>                     <span class="stringliteral">&quot;Any transmission attempts will fail in civilized fashion, so we will just no-op here.&quot;</span>);</div>
<div class="line"><a id="l00800" name="l00800"></a><span class="lineno">  800</span>    <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a id="l00801" name="l00801"></a><span class="lineno">  801</span>  }</div>
<div class="line"><a id="l00802" name="l00802"></a><span class="lineno">  802</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l00803" name="l00803"></a><span class="lineno">  803</span> </div>
<div class="line"><a id="l00804" name="l00804"></a><span class="lineno">  804</span>  FLOW_LOG_INFO(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Replacing event-wait handles (probably to replace &quot;</span></div>
<div class="line"><a id="l00805" name="l00805"></a><span class="lineno">  805</span>                <span class="stringliteral">&quot;underlying execution context without outside event loop&#39;s boost.asio Task_engine or similar).&quot;</span>);</div>
<div class="line"><a id="l00806" name="l00806"></a><span class="lineno">  806</span> </div>
<div class="line"><a id="l00807" name="l00807"></a><span class="lineno">  807</span>  assert(m_ev_wait_hndl_mq.is_open());</div>
<div class="line"><a id="l00808" name="l00808"></a><span class="lineno">  808</span>  assert(m_ev_wait_hndl_auto_ping_timer_fired_peer.is_open());</div>
<div class="line"><a id="l00809" name="l00809"></a><span class="lineno">  809</span> </div>
<div class="line"><a id="l00810" name="l00810"></a><span class="lineno">  810</span>  <a class="code hl_struct" href="structipc_1_1util_1_1Native__handle.html">Native_handle</a> saved(m_ev_wait_hndl_mq.release());</div>
<div class="line"><a id="l00811" name="l00811"></a><span class="lineno">  811</span>  m_ev_wait_hndl_mq = create_ev_wait_hndl_func();</div>
<div class="line"><a id="l00812" name="l00812"></a><span class="lineno">  812</span>  m_ev_wait_hndl_mq.assign(saved);</div>
<div class="line"><a id="l00813" name="l00813"></a><span class="lineno">  813</span> </div>
<div class="line"><a id="l00814" name="l00814"></a><span class="lineno">  814</span>  saved.<a class="code hl_variable" href="structipc_1_1util_1_1Native__handle.html#ab2f496740139c5752a25a30cf3325d86">m_native_handle</a> = m_ev_wait_hndl_auto_ping_timer_fired_peer.release();</div>
<div class="line"><a id="l00815" name="l00815"></a><span class="lineno">  815</span>  m_ev_wait_hndl_auto_ping_timer_fired_peer = create_ev_wait_hndl_func();</div>
<div class="line"><a id="l00816" name="l00816"></a><span class="lineno">  816</span>  m_ev_wait_hndl_auto_ping_timer_fired_peer.assign(saved);</div>
<div class="line"><a id="l00817" name="l00817"></a><span class="lineno">  817</span> </div>
<div class="line"><a id="l00818" name="l00818"></a><span class="lineno">  818</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a id="l00819" name="l00819"></a><span class="lineno">  819</span>} <span class="comment">// Blob_stream_mq_sender_impl::replace_event_wait_handles()</span></div>
<div class="line"><a id="l00820" name="l00820"></a><span class="lineno">  820</span> </div>
<div class="line"><a id="l00821" name="l00821"></a><span class="lineno">  821</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Persistent_mq_handle&gt;</div>
<div class="line"><a id="l00822" name="l00822"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#aa3116afe888df718c4ae10befcf2a16f">  822</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#aa3116afe888df718c4ae10befcf2a16f">Blob_stream_mq_sender_impl&lt;Persistent_mq_handle&gt;::</a></div>
<div class="line"><a id="l00823" name="l00823"></a><span class="lineno">  823</span><a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#aa3116afe888df718c4ae10befcf2a16f">       start_send_blob_ops</a>(<a class="code hl_typedef" href="namespaceipc_1_1util_1_1sync__io.html#aa0b9a3cc6bdc7dedbef4f9e06851aa24">util::sync_io::Event_wait_func</a>&amp;&amp; ev_wait_func)</div>
<div class="line"><a id="l00824" name="l00824"></a><span class="lineno">  824</span>{</div>
<div class="line"><a id="l00825" name="l00825"></a><span class="lineno">  825</span>  <span class="keywordflow">if</span> (!m_ev_wait_func.empty())</div>
<div class="line"><a id="l00826" name="l00826"></a><span class="lineno">  826</span>  {</div>
<div class="line"><a id="l00827" name="l00827"></a><span class="lineno">  827</span>    FLOW_LOG_WARNING(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Start-ops requested, &quot;</span></div>
<div class="line"><a id="l00828" name="l00828"></a><span class="lineno">  828</span>                     <span class="stringliteral">&quot;but we are already started.  Probably a user bug, but it is not for us to judge.&quot;</span>);</div>
<div class="line"><a id="l00829" name="l00829"></a><span class="lineno">  829</span>    <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a id="l00830" name="l00830"></a><span class="lineno">  830</span>  }</div>
<div class="line"><a id="l00831" name="l00831"></a><span class="lineno">  831</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l00832" name="l00832"></a><span class="lineno">  832</span> </div>
<div class="line"><a id="l00833" name="l00833"></a><span class="lineno">  833</span>  m_ev_wait_func = std::move(ev_wait_func);</div>
<div class="line"><a id="l00834" name="l00834"></a><span class="lineno">  834</span> </div>
<div class="line"><a id="l00835" name="l00835"></a><span class="lineno">  835</span>  FLOW_LOG_INFO(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Start-ops requested.  Done.&quot;</span>);</div>
<div class="line"><a id="l00836" name="l00836"></a><span class="lineno">  836</span> </div>
<div class="line"><a id="l00837" name="l00837"></a><span class="lineno">  837</span>  <span class="keywordflow">if</span> (!m_pending_err_code)</div>
<div class="line"><a id="l00838" name="l00838"></a><span class="lineno">  838</span>  {</div>
<div class="line"><a id="l00839" name="l00839"></a><span class="lineno">  839</span>    <span class="keyword">const</span> <span class="keyword">auto</span> protocol_ver_to_send = m_protocol_negotiator.local_max_proto_ver_for_sending();</div>
<div class="line"><a id="l00840" name="l00840"></a><span class="lineno">  840</span>    assert((protocol_ver_to_send != <a class="code hl_variable" href="classipc_1_1transport_1_1Protocol__negotiator.html#aa7e47f4f6a700aeaa9600a5426a17292">Protocol_negotiator::S_VER_UNKNOWN</a>)</div>
<div class="line"><a id="l00841" name="l00841"></a><span class="lineno">  841</span>           &amp;&amp; <span class="stringliteral">&quot;How&#39;d we get to this line twice?  Or Protocol_negotiator bug?&quot;</span>);</div>
<div class="line"><a id="l00842" name="l00842"></a><span class="lineno">  842</span>    assert((m_protocol_negotiator.local_max_proto_ver_for_sending() == <a class="code hl_variable" href="classipc_1_1transport_1_1Protocol__negotiator.html#aa7e47f4f6a700aeaa9600a5426a17292">Protocol_negotiator::S_VER_UNKNOWN</a>)</div>
<div class="line"><a id="l00843" name="l00843"></a><span class="lineno">  843</span>           &amp;&amp; <span class="stringliteral">&quot;Protocol_negotiator not properly marking the once-only sending-out of protocol version?&quot;</span>);</div>
<div class="line"><a id="l00844" name="l00844"></a><span class="lineno">  844</span> </div>
<div class="line"><a id="l00845" name="l00845"></a><span class="lineno">  845</span>    <span class="comment">/* As discussed in m_protocol_negotiator doc header and class doc header &quot;Protocol negotiation&quot; section:</span></div>
<div class="line"><a id="l00846" name="l00846"></a><span class="lineno">  846</span><span class="comment">     * send a special CONTROL message; opposing side expects it as the first in-message.</span></div>
<div class="line"><a id="l00847" name="l00847"></a><span class="lineno">  847</span><span class="comment">     * By the way m_protocol_negotiator logged about the fact we&#39;re about to send it, so we can be pretty quiet. */</span></div>
<div class="line"><a id="l00848" name="l00848"></a><span class="lineno">  848</span>    sync_write_or_q_ctl_cmd_impl(-protocol_ver_to_send);</div>
<div class="line"><a id="l00849" name="l00849"></a><span class="lineno">  849</span>    <span class="comment">/* m_pending_err_code may have become truthy; just means next send_blob()/whatever will emit that error.</span></div>
<div class="line"><a id="l00850" name="l00850"></a><span class="lineno">  850</span><span class="comment">     *</span></div>
<div class="line"><a id="l00851" name="l00851"></a><span class="lineno">  851</span><span class="comment">     * Otherwise: Either it inline-sent it (very likely), or it got queued.</span></div>
<div class="line"><a id="l00852" name="l00852"></a><span class="lineno">  852</span><span class="comment">     *            Either way: no error; let&#39;s get on with queuing-or-sending real stuff like send_blob() payloads.</span></div>
<div class="line"><a id="l00853" name="l00853"></a><span class="lineno">  853</span><span class="comment">     * P.S. There&#39;s only 1 protocol version as of this writing, so there&#39;s no ambiguity, and we can just get on with</span></div>
<div class="line"><a id="l00854" name="l00854"></a><span class="lineno">  854</span><span class="comment">     * sending stuff right away.  This could change in the future.  See m_protocol_negotiator doc header for more. */</span></div>
<div class="line"><a id="l00855" name="l00855"></a><span class="lineno">  855</span>  }</div>
<div class="line"><a id="l00856" name="l00856"></a><span class="lineno">  856</span>  <span class="comment">// else { Ctor must have failed without throwing exception (non-null err_code). }</span></div>
<div class="line"><a id="l00857" name="l00857"></a><span class="lineno">  857</span> </div>
<div class="line"><a id="l00858" name="l00858"></a><span class="lineno">  858</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a id="l00859" name="l00859"></a><span class="lineno">  859</span>} <span class="comment">// Blob_stream_mq_sender_impl::start_send_blob_ops()</span></div>
<div class="line"><a id="l00860" name="l00860"></a><span class="lineno">  860</span> </div>
<div class="line"><a id="l00861" name="l00861"></a><span class="lineno">  861</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Persistent_mq_handle&gt;</div>
<div class="line"><a id="l00862" name="l00862"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#aa7f092848ef3691dcf97182e5b3e2383">  862</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#aa7f092848ef3691dcf97182e5b3e2383">Blob_stream_mq_sender_impl&lt;Persistent_mq_handle&gt;::op_started</a>(<a class="code hl_typedef" href="namespaceipc_1_1util.html#ae6ac47812a90d1287c61e0b7de7bc4f5">util::String_view</a> context)<span class="keyword"> const</span></div>
<div class="line"><a id="l00863" name="l00863"></a><span class="lineno">  863</span><span class="keyword"></span>{</div>
<div class="line"><a id="l00864" name="l00864"></a><span class="lineno">  864</span>  <span class="keywordflow">if</span> (m_ev_wait_func.empty())</div>
<div class="line"><a id="l00865" name="l00865"></a><span class="lineno">  865</span>  {</div>
<div class="line"><a id="l00866" name="l00866"></a><span class="lineno">  866</span>    FLOW_LOG_WARNING(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: &quot;</span></div>
<div class="line"><a id="l00867" name="l00867"></a><span class="lineno">  867</span>                     <span class="stringliteral">&quot;In context [&quot;</span> &lt;&lt; context &lt;&lt; <span class="stringliteral">&quot;] we must be start_...()ed, &quot;</span></div>
<div class="line"><a id="l00868" name="l00868"></a><span class="lineno">  868</span>                     <span class="stringliteral">&quot;but we are not.  Probably a user bug, but it is not for us to judge.&quot;</span>);</div>
<div class="line"><a id="l00869" name="l00869"></a><span class="lineno">  869</span>    <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a id="l00870" name="l00870"></a><span class="lineno">  870</span>  }</div>
<div class="line"><a id="l00871" name="l00871"></a><span class="lineno">  871</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l00872" name="l00872"></a><span class="lineno">  872</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a id="l00873" name="l00873"></a><span class="lineno">  873</span>}</div>
<div class="line"><a id="l00874" name="l00874"></a><span class="lineno">  874</span> </div>
<div class="line"><a id="l00875" name="l00875"></a><span class="lineno">  875</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Persistent_mq_handle&gt;</div>
<div class="line"><a id="l00876" name="l00876"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#aba05c51d1033a4ea4ca03679f2fa1f8c">  876</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#aba05c51d1033a4ea4ca03679f2fa1f8c">Blob_stream_mq_sender_impl&lt;Persistent_mq_handle&gt;::send_blob</a>(<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc_1_1util.html#ae0be7edba7e30ffa3f8b742af621f2ab">util::Blob_const</a>&amp; blob, <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>* err_code)</div>
<div class="line"><a id="l00877" name="l00877"></a><span class="lineno">  877</span>{</div>
<div class="line"><a id="l00878" name="l00878"></a><span class="lineno">  878</span>  <span class="keyword">using </span>flow::util::buffers_dump_string;</div>
<div class="line"><a id="l00879" name="l00879"></a><span class="lineno">  879</span>  <span class="keyword">using </span><a class="code hl_typedef" href="namespaceipc_1_1util.html#ac66141280c3b7295a86b65209f31cc58">util::Fine_duration</a>;</div>
<div class="line"><a id="l00880" name="l00880"></a><span class="lineno">  880</span>  <span class="keyword">using </span>boost::chrono::round;</div>
<div class="line"><a id="l00881" name="l00881"></a><span class="lineno">  881</span>  <span class="keyword">using </span>boost::chrono::milliseconds;</div>
<div class="line"><a id="l00882" name="l00882"></a><span class="lineno">  882</span> </div>
<div class="line"><a id="l00883" name="l00883"></a><span class="lineno">  883</span>  FLOW_ERROR_EXEC_AND_THROW_ON_ERROR(<span class="keywordtype">bool</span>, <a class="code hl_class" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html">Blob_stream_mq_sender_impl&lt;Persistent_mq_handle&gt;::send_blob</a>,</div>
<div class="line"><a id="l00884" name="l00884"></a><span class="lineno">  884</span>                                     flow::util::bind_ns::cref(blob), _1);</div>
<div class="line"><a id="l00885" name="l00885"></a><span class="lineno">  885</span>  <span class="comment">// ^-- Call ourselves and return if err_code is null.  If got to present line, err_code is not null.</span></div>
<div class="line"><a id="l00886" name="l00886"></a><span class="lineno">  886</span> </div>
<div class="line"><a id="l00887" name="l00887"></a><span class="lineno">  887</span>  assert((blob.size() != 0) &amp;&amp; <span class="stringliteral">&quot;Do not send_blob() empty blobs.&quot;</span>);</div>
<div class="line"><a id="l00888" name="l00888"></a><span class="lineno">  888</span> </div>
<div class="line"><a id="l00889" name="l00889"></a><span class="lineno">  889</span>  <span class="comment">/* We comment liberally, but tactically, inline; but please read the strategy in the class doc header&#39;s impl section.</span></div>
<div class="line"><a id="l00890" name="l00890"></a><span class="lineno">  890</span><span class="comment">   *</span></div>
<div class="line"><a id="l00891" name="l00891"></a><span class="lineno">  891</span><span class="comment">   * There is a *lot* of similarity between this and sync_io::Native_socket_stream::Impl::send_native_handle().</span></div>
<div class="line"><a id="l00892" name="l00892"></a><span class="lineno">  892</span><span class="comment">   * In fact I (ygoldfel) wrote that guy&#39;s send stuff first, then I based this off it.</span></div>
<div class="line"><a id="l00893" name="l00893"></a><span class="lineno">  893</span><span class="comment">   * Yet there are enough differences to where code reuse isn&#39;t really obviously achievable.</span></div>
<div class="line"><a id="l00894" name="l00894"></a><span class="lineno">  894</span><span class="comment">   * @todo Look into it.  It would be nice to avoid 2x the maintenance and ~copy/pasted comments. */</span></div>
<div class="line"><a id="l00895" name="l00895"></a><span class="lineno">  895</span> </div>
<div class="line"><a id="l00896" name="l00896"></a><span class="lineno">  896</span>  <span class="keywordflow">if</span> (!op_started(<span class="stringliteral">&quot;send_blob()&quot;</span>))</div>
<div class="line"><a id="l00897" name="l00897"></a><span class="lineno">  897</span>  {</div>
<div class="line"><a id="l00898" name="l00898"></a><span class="lineno">  898</span>    err_code-&gt;clear();</div>
<div class="line"><a id="l00899" name="l00899"></a><span class="lineno">  899</span>    <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a id="l00900" name="l00900"></a><span class="lineno">  900</span>  }</div>
<div class="line"><a id="l00901" name="l00901"></a><span class="lineno">  901</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l00902" name="l00902"></a><span class="lineno">  902</span> </div>
<div class="line"><a id="l00903" name="l00903"></a><span class="lineno">  903</span>  FLOW_LOG_TRACE(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Will send blob of size [&quot;</span> &lt;&lt; blob.size() &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00904" name="l00904"></a><span class="lineno">  904</span>  <span class="comment">// Verbose and slow (100% skipped unless log filter passes).</span></div>
<div class="line"><a id="l00905" name="l00905"></a><span class="lineno">  905</span>  FLOW_LOG_DATA(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Blob contents are &quot;</span></div>
<div class="line"><a id="l00906" name="l00906"></a><span class="lineno">  906</span>                <span class="stringliteral">&quot;[\n&quot;</span> &lt;&lt; buffers_dump_string(blob, <span class="stringliteral">&quot;  &quot;</span>) &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l00907" name="l00907"></a><span class="lineno">  907</span> </div>
<div class="line"><a id="l00908" name="l00908"></a><span class="lineno">  908</span>  <span class="keywordflow">if</span> (m_finished)</div>
<div class="line"><a id="l00909" name="l00909"></a><span class="lineno">  909</span>  {</div>
<div class="line"><a id="l00910" name="l00910"></a><span class="lineno">  910</span>    <span class="comment">/* If they called *end_sending() before, then by definition (see doc header impl discussion)</span></div>
<div class="line"><a id="l00911" name="l00911"></a><span class="lineno">  911</span><span class="comment">     * any future send attempt is to be ignored with this error.  Even though previously queued stuff can and should</span></div>
<div class="line"><a id="l00912" name="l00912"></a><span class="lineno">  912</span><span class="comment">     * keep being sent, once that&#39;s done this clause will prevent any more from being initiated.</span></div>
<div class="line"><a id="l00913" name="l00913"></a><span class="lineno">  913</span><span class="comment">     *</span></div>
<div class="line"><a id="l00914" name="l00914"></a><span class="lineno">  914</span><span class="comment">     * Corner case: If those queued sends indeed exist (are ongoing) then user should have a way of knowing when it&#39;s</span></div>
<div class="line"><a id="l00915" name="l00915"></a><span class="lineno">  915</span><span class="comment">     * done.  That isn&#39;t the case for regular send_blob() calls which are silently queued up as-needed,</span></div>
<div class="line"><a id="l00916" name="l00916"></a><span class="lineno">  916</span><span class="comment">     * which is why I mention it here.  So that&#39;s why in *end_sending() there&#39;s a way for</span></div>
<div class="line"><a id="l00917" name="l00917"></a><span class="lineno">  917</span><span class="comment">     * user to be informed (via sync callback) when everything has been sent through, or if an error stops it</span></div>
<div class="line"><a id="l00918" name="l00918"></a><span class="lineno">  918</span><span class="comment">     * from happening.  None of our business here though: we just refuse to do anything and emit this error. */</span></div>
<div class="line"><a id="l00919" name="l00919"></a><span class="lineno">  919</span>    *err_code = <a class="code hl_enumvalue" href="namespaceipc_1_1transport_1_1error.html#adfef15ef4e76cc55d652fbd9c2797297a42d41c622e92e9053177ba73e75633fe">error::Code::S_SENDS_FINISHED_CANNOT_SEND</a>;</div>
<div class="line"><a id="l00920" name="l00920"></a><span class="lineno">  920</span>    <span class="comment">// Note that this clause will always be reached subsequently also.</span></div>
<div class="line"><a id="l00921" name="l00921"></a><span class="lineno">  921</span>  }</div>
<div class="line"><a id="l00922" name="l00922"></a><span class="lineno">  922</span>  <span class="keywordflow">else</span></div>
<div class="line"><a id="l00923" name="l00923"></a><span class="lineno">  923</span>    <span class="comment">/* Check for message size limit.  Just catch it immediately and bail out; and no harm (to pipe) done otherwise.</span></div>
<div class="line"><a id="l00924" name="l00924"></a><span class="lineno">  924</span><span class="comment">     *</span></div>
<div class="line"><a id="l00925" name="l00925"></a><span class="lineno">  925</span><span class="comment">     * This is a subtler decision than it might seem.  If we simply skipped this, things would still work:</span></div>
<div class="line"><a id="l00926" name="l00926"></a><span class="lineno">  926</span><span class="comment">     * An immediate try_send() would yield S_MQ_MESSAGE_SIZE_OVER_OR_UNDERFLOW error; and if the send had</span></div>
<div class="line"><a id="l00927" name="l00927"></a><span class="lineno">  927</span><span class="comment">     * to be queued, then a post-async-wait try_send() would yield that same thing later.</span></div>
<div class="line"><a id="l00928" name="l00928"></a><span class="lineno">  928</span><span class="comment">     * However that would hose the pipe, as it is a low-level error.  The Blob_sender concept allows this: it says</span></div>
<div class="line"><a id="l00929" name="l00929"></a><span class="lineno">  929</span><span class="comment">     * a blob size limit *may* be imposed and yield INVALID_ARGUMENT, which shall not hose the pipe.</span></div>
<div class="line"><a id="l00930" name="l00930"></a><span class="lineno">  930</span><span class="comment">     * It&#39;s &quot;may&quot; -- not &quot;shall&quot; -- so we&#39;re just being nice and usable.  The only caveat is we&#39;re kinda preempting</span></div>
<div class="line"><a id="l00931" name="l00931"></a><span class="lineno">  931</span><span class="comment">     * the MQ&#39;s low-level check by doing it manually ourselves, querying/caching MQ&#39;s max_msg_size().  Arguably not</span></div>
<div class="line"><a id="l00932" name="l00932"></a><span class="lineno">  932</span><span class="comment">     * the prettiest, but the effect is correct (at least with Posix_mq_handle and Bipc_mq_handle anyway).</span></div>
<div class="line"><a id="l00933" name="l00933"></a><span class="lineno">  933</span><span class="comment">     *</span></div>
<div class="line"><a id="l00934" name="l00934"></a><span class="lineno">  934</span><span class="comment">     * We could also catch S_MQ_MESSAGE_SIZE_OVER_OR_UNDERFLOW and transform it to INVALID_ARGUMENT... but if it</span></div>
<div class="line"><a id="l00935" name="l00935"></a><span class="lineno">  935</span><span class="comment">     * has to be queued, then things get complicated or inconsistent; it would be reported in a later</span></div>
<div class="line"><a id="l00936" name="l00936"></a><span class="lineno">  936</span><span class="comment">     * user API call.  So let&#39;s not.  This way the behavior is same as with Native_socket_stream; not required by</span></div>
<div class="line"><a id="l00937" name="l00937"></a><span class="lineno">  937</span><span class="comment">     * the concept but good nevertheless. */</span></div>
<div class="line"><a id="l00938" name="l00938"></a><span class="lineno">  938</span>    <span class="keywordflow">if</span> (blob.size() &gt; m_mq_max_msg_sz) <span class="comment">// &amp;&amp; (!m_finished)</span></div>
<div class="line"><a id="l00939" name="l00939"></a><span class="lineno">  939</span>  {</div>
<div class="line"><a id="l00940" name="l00940"></a><span class="lineno">  940</span>    *err_code = <a class="code hl_enumvalue" href="namespaceipc_1_1transport_1_1error.html#adfef15ef4e76cc55d652fbd9c2797297ac416e988563e44bf15fc6a81743eef53">error::Code::S_INVALID_ARGUMENT</a>;</div>
<div class="line"><a id="l00941" name="l00941"></a><span class="lineno">  941</span>    FLOW_LOG_WARNING(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Send: &quot;</span></div>
<div class="line"><a id="l00942" name="l00942"></a><span class="lineno">  942</span>                     <span class="stringliteral">&quot;User argument length [&quot;</span> &lt;&lt; blob.size() &lt;&lt; <span class="stringliteral">&quot;] exceeds limit [&quot;</span> &lt;&lt; send_blob_max_size() &lt;&lt; <span class="stringliteral">&quot;].  &quot;</span></div>
<div class="line"><a id="l00943" name="l00943"></a><span class="lineno">  943</span>                     <span class="stringliteral">&quot;Emitting error immediately; but pipe continues.  Note that if we don&#39;t do this, &quot;</span></div>
<div class="line"><a id="l00944" name="l00944"></a><span class="lineno">  944</span>                     <span class="stringliteral">&quot;then the low-level MQ will behave this way anyway.&quot;</span>);</div>
<div class="line"><a id="l00945" name="l00945"></a><span class="lineno">  945</span>  }</div>
<div class="line"><a id="l00946" name="l00946"></a><span class="lineno">  946</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (m_pending_err_code) <span class="comment">// &amp;&amp; (!m_finished) &amp;&amp; (blob.size() OK)</span></div>
<div class="line"><a id="l00947" name="l00947"></a><span class="lineno">  947</span>  {</div>
<div class="line"><a id="l00948" name="l00948"></a><span class="lineno">  948</span>    <span class="comment">/* This --^ holds either the last inline-completed send_blob() (or protocol-negotiation-send in</span></div>
<div class="line"><a id="l00949" name="l00949"></a><span class="lineno">  949</span><span class="comment">     * start_send_blob_ops()) call&#39;s emitted Error_code, or (~rarely) one</span></div>
<div class="line"><a id="l00950" name="l00950"></a><span class="lineno">  950</span><span class="comment">     * that was found while attempting to dequeue previously-would-blocked queued-up (due to incomplete s_blob())</span></div>
<div class="line"><a id="l00951" name="l00951"></a><span class="lineno">  951</span><span class="comment">     * payload(s).  This may seem odd, but that&#39;s part of the design of the send interface which we wanted to be</span></div>
<div class="line"><a id="l00952" name="l00952"></a><span class="lineno">  952</span><span class="comment">     * as close to looking like a series of synchronous always-inline-completed send_blob() calls as humanly possible,</span></div>
<div class="line"><a id="l00953" name="l00953"></a><span class="lineno">  953</span><span class="comment">     * especially given that 99.9999% of the time that will indeed occur given proper behavior by the opposing</span></div>
<div class="line"><a id="l00954" name="l00954"></a><span class="lineno">  954</span><span class="comment">     * receiver. */</span></div>
<div class="line"><a id="l00955" name="l00955"></a><span class="lineno">  955</span> </div>
<div class="line"><a id="l00956" name="l00956"></a><span class="lineno">  956</span>    FLOW_LOG_INFO(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: An error was detected earlier and saved for any &quot;</span></div>
<div class="line"><a id="l00957" name="l00957"></a><span class="lineno">  957</span>                  <span class="stringliteral">&quot;subsequent send attempts like this.  Will not proceed with send.  More info in WARNING below.&quot;</span>);</div>
<div class="line"><a id="l00958" name="l00958"></a><span class="lineno">  958</span>    *err_code = m_pending_err_code;</div>
<div class="line"><a id="l00959" name="l00959"></a><span class="lineno">  959</span>  }</div>
<div class="line"><a id="l00960" name="l00960"></a><span class="lineno">  960</span>  <span class="keywordflow">else</span> <span class="comment">// if (!m_finished) &amp;&amp; (blob.size() OK) &amp;&amp; (!m_pending_err_code)</span></div>
<div class="line"><a id="l00961" name="l00961"></a><span class="lineno">  961</span>  {</div>
<div class="line"><a id="l00962" name="l00962"></a><span class="lineno">  962</span>    <span class="comment">/* As the name indicates this may synchronously finish it or queue it up instead to be done once</span></div>
<div class="line"><a id="l00963" name="l00963"></a><span class="lineno">  963</span><span class="comment">     * a would-block clears, when user informs of this past the present function&#39;s return.</span></div>
<div class="line"><a id="l00964" name="l00964"></a><span class="lineno">  964</span><span class="comment">     *</span></div>
<div class="line"><a id="l00965" name="l00965"></a><span class="lineno">  965</span><span class="comment">     * Send-or-queue the 1 message, as-is.  There&#39;s a very high chance it is done inline;</span></div>
<div class="line"><a id="l00966" name="l00966"></a><span class="lineno">  966</span><span class="comment">     * but there&#39;s a small chance either there&#39;s either stuff queued already (we&#39;ve delegated waiting for would-block</span></div>
<div class="line"><a id="l00967" name="l00967"></a><span class="lineno">  967</span><span class="comment">     * to clear to user), or not but this can&#39;t be pushed (encountered would-block).  We don&#39;t care here per</span></div>
<div class="line"><a id="l00968" name="l00968"></a><span class="lineno">  968</span><span class="comment">     * se; I am just saying for context, to clarify what &quot;send-or-queue&quot; means. */</span></div>
<div class="line"><a id="l00969" name="l00969"></a><span class="lineno">  969</span>    sync_write_or_q_payload(blob, <span class="keyword">nullptr</span>);</div>
<div class="line"><a id="l00970" name="l00970"></a><span class="lineno">  970</span>    <span class="comment">/* That may have returned `true` indicating everything (up to and including our payload) was synchronously</span></div>
<div class="line"><a id="l00971" name="l00971"></a><span class="lineno">  971</span><span class="comment">     * given to kernel successfuly; or this will never occur, because outgoing-pipe-ending error was encountered.</span></div>
<div class="line"><a id="l00972" name="l00972"></a><span class="lineno">  972</span><span class="comment">     * Since this is send_blob(), we do not care: there is no on-done</span></div>
<div class="line"><a id="l00973" name="l00973"></a><span class="lineno">  973</span><span class="comment">     * callback to invoke, as m_finished is false, as *end_sending() has not been called yet. */</span></div>
<div class="line"><a id="l00974" name="l00974"></a><span class="lineno">  974</span> </div>
<div class="line"><a id="l00975" name="l00975"></a><span class="lineno">  975</span>    <span class="comment">/* No new error: Emit to user that this op did not emit error (m_pending_err_code is still falsy).</span></div>
<div class="line"><a id="l00976" name="l00976"></a><span class="lineno">  976</span><span class="comment">     * New error: Any subsequent attempt will emit this truthy value; do not forget to emit it now via *err_code. */</span></div>
<div class="line"><a id="l00977" name="l00977"></a><span class="lineno">  977</span>    *err_code = m_pending_err_code;</div>
<div class="line"><a id="l00978" name="l00978"></a><span class="lineno">  978</span> </div>
<div class="line"><a id="l00979" name="l00979"></a><span class="lineno">  979</span>    <span class="comment">// Did it generate a new error?</span></div>
<div class="line"><a id="l00980" name="l00980"></a><span class="lineno">  980</span>    <span class="keywordflow">if</span> (*err_code)</div>
<div class="line"><a id="l00981" name="l00981"></a><span class="lineno">  981</span>    {</div>
<div class="line"><a id="l00982" name="l00982"></a><span class="lineno">  982</span>      FLOW_LOG_TRACE(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Wanted to send user message but detected error &quot;</span></div>
<div class="line"><a id="l00983" name="l00983"></a><span class="lineno">  983</span>                     <span class="stringliteral">&quot;synchronously.  &quot;</span></div>
<div class="line"><a id="l00984" name="l00984"></a><span class="lineno">  984</span>                     <span class="stringliteral">&quot;Error code details follow: [&quot;</span> &lt;&lt; *err_code &lt;&lt; <span class="stringliteral">&quot;] [&quot;</span> &lt;&lt; err_code-&gt;message() &lt;&lt; <span class="stringliteral">&quot;].  &quot;</span></div>
<div class="line"><a id="l00985" name="l00985"></a><span class="lineno">  985</span>                     <span class="stringliteral">&quot;Saved error code to return in next user send attempt if any, after this attempt also &quot;</span></div>
<div class="line"><a id="l00986" name="l00986"></a><span class="lineno">  986</span>                     <span class="stringliteral">&quot;returns that error code synchronously first.&quot;</span>);</div>
<div class="line"><a id="l00987" name="l00987"></a><span class="lineno">  987</span>    }</div>
<div class="line"><a id="l00988" name="l00988"></a><span class="lineno">  988</span>    <span class="keywordflow">else</span> <span class="keywordflow">if</span> (m_auto_ping_period != Fine_duration::zero()) <span class="comment">// &amp;&amp; (!*err_code)</span></div>
<div class="line"><a id="l00989" name="l00989"></a><span class="lineno">  989</span>    {</div>
<div class="line"><a id="l00990" name="l00990"></a><span class="lineno">  990</span>      <span class="comment">/* Send requested, and there was no error; that represents non-idleness.  If auto_ping() has been called</span></div>
<div class="line"><a id="l00991" name="l00991"></a><span class="lineno">  991</span><span class="comment">       * (the feature is engaged), idleness shall occur at worst in m_auto_ping_period; hence reschedule</span></div>
<div class="line"><a id="l00992" name="l00992"></a><span class="lineno">  992</span><span class="comment">       * on_ev_auto_ping_now_timer_fired(). */</span></div>
<div class="line"><a id="l00993" name="l00993"></a><span class="lineno">  993</span> </div>
<div class="line"><a id="l00994" name="l00994"></a><span class="lineno">  994</span>      <span class="keyword">const</span> <span class="keywordtype">size_t</span> n_canceled = m_auto_ping_timer.expires_after(m_auto_ping_period);</div>
<div class="line"><a id="l00995" name="l00995"></a><span class="lineno">  995</span> </div>
<div class="line"><a id="l00996" name="l00996"></a><span class="lineno">  996</span>      FLOW_LOG_TRACE(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Send request from user; hence rescheduled &quot;</span></div>
<div class="line"><a id="l00997" name="l00997"></a><span class="lineno">  997</span>                     <span class="stringliteral">&quot;auto-ping to occur in &quot;</span></div>
<div class="line"><a id="l00998" name="l00998"></a><span class="lineno">  998</span>                     <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; round&lt;milliseconds&gt;(m_auto_ping_period) &lt;&lt; <span class="stringliteral">&quot;] (will re-reschedule &quot;</span></div>
<div class="line"><a id="l00999" name="l00999"></a><span class="lineno">  999</span>                     <span class="stringliteral">&quot;again upon any other outgoing traffic that might be requested before then).  As a result &quot;</span></div>
<div class="line"><a id="l01000" name="l01000"></a><span class="lineno"> 1000</span>                     <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; n_canceled &lt;&lt; <span class="stringliteral">&quot;] previously scheduled auto-pings have been canceled; 1 is most likely; &quot;</span></div>
<div class="line"><a id="l01001" name="l01001"></a><span class="lineno"> 1001</span>                     <span class="stringliteral">&quot;0 means an auto-ping is *just* about to fire (we lost the race -- which is fine).&quot;</span>);</div>
<div class="line"><a id="l01002" name="l01002"></a><span class="lineno"> 1002</span>      <span class="keywordflow">if</span> (n_canceled == 1)</div>
<div class="line"><a id="l01003" name="l01003"></a><span class="lineno"> 1003</span>      {</div>
<div class="line"><a id="l01004" name="l01004"></a><span class="lineno"> 1004</span>        <span class="comment">/* m_timer_worker will m_auto_ping_timer.async_wait(F), where F() will signal through pipe,</span></div>
<div class="line"><a id="l01005" name="l01005"></a><span class="lineno"> 1005</span><span class="comment">         * making *m_auto_ping_timer_fired_peer readable.  We&#39;ve already used m_ev_wait_func() to start</span></div>
<div class="line"><a id="l01006" name="l01006"></a><span class="lineno"> 1006</span><span class="comment">         * wait on it being readable and invoke on_ev_auto_ping_now_timer_fired() in that case; but we&#39;ve</span></div>
<div class="line"><a id="l01007" name="l01007"></a><span class="lineno"> 1007</span><span class="comment">         * canceled the previous .async_wait() that would make it readable; so just redo that part. */</span></div>
<div class="line"><a id="l01008" name="l01008"></a><span class="lineno"> 1008</span>        m_timer_worker.timer_async_wait(&amp;m_auto_ping_timer, m_auto_ping_timer_fired_peer);</div>
<div class="line"><a id="l01009" name="l01009"></a><span class="lineno"> 1009</span>      }</div>
<div class="line"><a id="l01010" name="l01010"></a><span class="lineno"> 1010</span>      <span class="keywordflow">else</span></div>
<div class="line"><a id="l01011" name="l01011"></a><span class="lineno"> 1011</span>      {</div>
<div class="line"><a id="l01012" name="l01012"></a><span class="lineno"> 1012</span>        assert((n_canceled == 0) &amp;&amp; <span class="stringliteral">&quot;We only invoke one timer async_wait() at a time.&quot;</span>);</div>
<div class="line"><a id="l01013" name="l01013"></a><span class="lineno"> 1013</span> </div>
<div class="line"><a id="l01014" name="l01014"></a><span class="lineno"> 1014</span>        <span class="comment">/* Too late to cancel on_ev_auto_ping_now_timer_fired(), so it&#39;ll just schedule next one itself.</span></div>
<div class="line"><a id="l01015" name="l01015"></a><span class="lineno"> 1015</span><span class="comment">         * Note that in practice the effect is about the same. */</span></div>
<div class="line"><a id="l01016" name="l01016"></a><span class="lineno"> 1016</span>      }</div>
<div class="line"><a id="l01017" name="l01017"></a><span class="lineno"> 1017</span>    } <span class="comment">// else if (m_auto_ping_period != zero) &amp;&amp; (!*err_code)</span></div>
<div class="line"><a id="l01018" name="l01018"></a><span class="lineno"> 1018</span>    <span class="comment">// else if (m_auto_ping_period == zero) &amp;&amp; (!*err_code) { Auto-ping feature not engaged. }</span></div>
<div class="line"><a id="l01019" name="l01019"></a><span class="lineno"> 1019</span>  } <span class="comment">/* else if (!m_finished) &amp;&amp; (blob.size() OK) &amp;&amp; (!m_pending_err_code)</span></div>
<div class="line"><a id="l01020" name="l01020"></a><span class="lineno"> 1020</span><span class="comment">     *         (but m_pending_err_code may have become truthy inside) */</span></div>
<div class="line"><a id="l01021" name="l01021"></a><span class="lineno"> 1021</span> </div>
<div class="line"><a id="l01022" name="l01022"></a><span class="lineno"> 1022</span>  <span class="keywordflow">if</span> (*err_code)</div>
<div class="line"><a id="l01023" name="l01023"></a><span class="lineno"> 1023</span>  {</div>
<div class="line"><a id="l01024" name="l01024"></a><span class="lineno"> 1024</span>    <span class="comment">// At the end try to categorize nature of error.</span></div>
<div class="line"><a id="l01025" name="l01025"></a><span class="lineno"> 1025</span>    FLOW_LOG_WARNING(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Wanted to send blob of size &quot;</span></div>
<div class="line"><a id="l01026" name="l01026"></a><span class="lineno"> 1026</span>                     <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; blob.size() &lt;&lt; <span class="stringliteral">&quot;], but an error (not necessarily new error) &quot;</span></div>
<div class="line"><a id="l01027" name="l01027"></a><span class="lineno"> 1027</span>                     <span class="stringliteral">&quot;encountered on pipe or in user API args.  Error code details follow: &quot;</span></div>
<div class="line"><a id="l01028" name="l01028"></a><span class="lineno"> 1028</span>                     <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; *err_code &lt;&lt; <span class="stringliteral">&quot;] [&quot;</span> &lt;&lt; err_code-&gt;message() &lt;&lt; <span class="stringliteral">&quot;];  &quot;</span></div>
<div class="line"><a id="l01029" name="l01029"></a><span class="lineno"> 1029</span>                     <span class="stringliteral">&quot;pipe hosed (sys/protocol error)? = &quot;</span></div>
<div class="line"><a id="l01030" name="l01030"></a><span class="lineno"> 1030</span>                     <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; ((*err_code != <a class="code hl_enumvalue" href="namespaceipc_1_1transport_1_1error.html#adfef15ef4e76cc55d652fbd9c2797297ac416e988563e44bf15fc6a81743eef53">error::Code::S_INVALID_ARGUMENT</a>)</div>
<div class="line"><a id="l01031" name="l01031"></a><span class="lineno"> 1031</span>                             &amp;&amp; (*err_code != <a class="code hl_enumvalue" href="namespaceipc_1_1transport_1_1error.html#adfef15ef4e76cc55d652fbd9c2797297a42d41c622e92e9053177ba73e75633fe">error::Code::S_SENDS_FINISHED_CANNOT_SEND</a>)) &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l01032" name="l01032"></a><span class="lineno"> 1032</span>                     <span class="stringliteral">&quot;sending disabled by user? = &quot;</span></div>
<div class="line"><a id="l01033" name="l01033"></a><span class="lineno"> 1033</span>                     <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; (*err_code == <a class="code hl_enumvalue" href="namespaceipc_1_1transport_1_1error.html#adfef15ef4e76cc55d652fbd9c2797297a42d41c622e92e9053177ba73e75633fe">error::Code::S_SENDS_FINISHED_CANNOT_SEND</a>) &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l01034" name="l01034"></a><span class="lineno"> 1034</span>  }</div>
<div class="line"><a id="l01035" name="l01035"></a><span class="lineno"> 1035</span> </div>
<div class="line"><a id="l01036" name="l01036"></a><span class="lineno"> 1036</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a id="l01037" name="l01037"></a><span class="lineno"> 1037</span>} <span class="comment">// Blob_stream_mq_sender_impl::send_blob()</span></div>
<div class="line"><a id="l01038" name="l01038"></a><span class="lineno"> 1038</span> </div>
<div class="line"><a id="l01039" name="l01039"></a><span class="lineno"> 1039</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Persistent_mq_handle&gt;</div>
<div class="line"><a id="l01040" name="l01040"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a66bdd766d92029aa20d50b97edae0ce5"> 1040</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a66bdd766d92029aa20d50b97edae0ce5">Blob_stream_mq_sender_impl&lt;Persistent_mq_handle&gt;::end_sending</a>()</div>
<div class="line"><a id="l01041" name="l01041"></a><span class="lineno"> 1041</span>{</div>
<div class="line"><a id="l01042" name="l01042"></a><span class="lineno"> 1042</span>  <span class="keywordflow">return</span> async_end_sending_impl(<span class="keyword">nullptr</span>, flow::async::Task_asio_err());</div>
<div class="line"><a id="l01043" name="l01043"></a><span class="lineno"> 1043</span>}</div>
<div class="line"><a id="l01044" name="l01044"></a><span class="lineno"> 1044</span> </div>
<div class="line"><a id="l01045" name="l01045"></a><span class="lineno"> 1045</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Persistent_mq_handle&gt;</div>
<div class="line"><a id="l01046" name="l01046"></a><span class="lineno"> 1046</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Task_err&gt;</div>
<div class="line"><a id="l01047" name="l01047"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a4709b00fb1a8fc0ea63535d0a47f15f0"> 1047</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a4709b00fb1a8fc0ea63535d0a47f15f0">Blob_stream_mq_sender_impl&lt;Persistent_mq_handle&gt;::async_end_sending</a>(<a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>* sync_err_code_ptr,</div>
<div class="line"><a id="l01048" name="l01048"></a><span class="lineno"> 1048</span>                                                                         Task_err&amp;&amp; on_done_func)</div>
<div class="line"><a id="l01049" name="l01049"></a><span class="lineno"> 1049</span>{</div>
<div class="line"><a id="l01050" name="l01050"></a><span class="lineno"> 1050</span>  <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a> sync_err_code;</div>
<div class="line"><a id="l01051" name="l01051"></a><span class="lineno"> 1051</span>  <span class="comment">// This guy either takes null/.empty(), or non-null/non-.empty(): it doesn&#39;t do the Flow-style error emission itself.</span></div>
<div class="line"><a id="l01052" name="l01052"></a><span class="lineno"> 1052</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> ok = async_end_sending_impl(&amp;sync_err_code, flow::async::Task_asio_err(std::move(on_done_func)));</div>
<div class="line"><a id="l01053" name="l01053"></a><span class="lineno"> 1053</span> </div>
<div class="line"><a id="l01054" name="l01054"></a><span class="lineno"> 1054</span>  <span class="keywordflow">if</span> (!ok)</div>
<div class="line"><a id="l01055" name="l01055"></a><span class="lineno"> 1055</span>  {</div>
<div class="line"><a id="l01056" name="l01056"></a><span class="lineno"> 1056</span>    <span class="keywordflow">return</span> <span class="keyword">false</span>; <span class="comment">// False start.</span></div>
<div class="line"><a id="l01057" name="l01057"></a><span class="lineno"> 1057</span>  }</div>
<div class="line"><a id="l01058" name="l01058"></a><span class="lineno"> 1058</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l01059" name="l01059"></a><span class="lineno"> 1059</span> </div>
<div class="line"><a id="l01060" name="l01060"></a><span class="lineno"> 1060</span>  <span class="comment">// Standard error-reporting semantics.</span></div>
<div class="line"><a id="l01061" name="l01061"></a><span class="lineno"> 1061</span>  <span class="keywordflow">if</span> ((!sync_err_code_ptr) &amp;&amp; sync_err_code)</div>
<div class="line"><a id="l01062" name="l01062"></a><span class="lineno"> 1062</span>  {</div>
<div class="line"><a id="l01063" name="l01063"></a><span class="lineno"> 1063</span>    <span class="keywordflow">throw</span> flow::error::Runtime_error(sync_err_code, <span class="stringliteral">&quot;Blob_stream_mq_sender_impl::async_end_sending()&quot;</span>);</div>
<div class="line"><a id="l01064" name="l01064"></a><span class="lineno"> 1064</span>  }</div>
<div class="line"><a id="l01065" name="l01065"></a><span class="lineno"> 1065</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l01066" name="l01066"></a><span class="lineno"> 1066</span>  sync_err_code_ptr &amp;&amp; (*sync_err_code_ptr = sync_err_code);</div>
<div class="line"><a id="l01067" name="l01067"></a><span class="lineno"> 1067</span>  <span class="comment">// And if (!sync_err_code_ptr) + no error =&gt; no throw.</span></div>
<div class="line"><a id="l01068" name="l01068"></a><span class="lineno"> 1068</span> </div>
<div class="line"><a id="l01069" name="l01069"></a><span class="lineno"> 1069</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a id="l01070" name="l01070"></a><span class="lineno"> 1070</span>} <span class="comment">// Blob_stream_mq_sender_impl::async_end_sending()</span></div>
<div class="line"><a id="l01071" name="l01071"></a><span class="lineno"> 1071</span> </div>
<div class="line"><a id="l01072" name="l01072"></a><span class="lineno"> 1072</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Persistent_mq_handle&gt;</div>
<div class="line"><a id="l01073" name="l01073"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#adc7d43cbe05d4ad239d7abcf010955db"> 1073</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#adc7d43cbe05d4ad239d7abcf010955db">Blob_stream_mq_sender_impl&lt;Persistent_mq_handle&gt;::async_end_sending_impl</a></div>
<div class="line"><a id="l01074" name="l01074"></a><span class="lineno"> 1074</span>       (<a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>* sync_err_code_ptr_or_null, flow::async::Task_asio_err&amp;&amp; on_done_func_or_empty)</div>
<div class="line"><a id="l01075" name="l01075"></a><span class="lineno"> 1075</span>{</div>
<div class="line"><a id="l01076" name="l01076"></a><span class="lineno"> 1076</span>  <span class="keyword">using </span>flow::async::Task_asio_err;</div>
<div class="line"><a id="l01077" name="l01077"></a><span class="lineno"> 1077</span> </div>
<div class="line"><a id="l01078" name="l01078"></a><span class="lineno"> 1078</span>  assert((<span class="keywordtype">bool</span>(sync_err_code_ptr_or_null) == (!on_done_func_or_empty.empty()))</div>
<div class="line"><a id="l01079" name="l01079"></a><span class="lineno"> 1079</span>         &amp;&amp; <span class="stringliteral">&quot;Our contract: indicate whether we care about completion at all -- or not at all -- no in-between.&quot;</span>);</div>
<div class="line"><a id="l01080" name="l01080"></a><span class="lineno"> 1080</span> </div>
<div class="line"><a id="l01081" name="l01081"></a><span class="lineno"> 1081</span>  <span class="comment">/* We comment liberally, but tactically, inline; but please read the strategy in the class doc header&#39;s impl section.</span></div>
<div class="line"><a id="l01082" name="l01082"></a><span class="lineno"> 1082</span><span class="comment">   *</span></div>
<div class="line"><a id="l01083" name="l01083"></a><span class="lineno"> 1083</span><span class="comment">   * There is a *lot* of similarity between this and sync_io::Native_socket_stream::Impl::async_end_sending[_impl]().</span></div>
<div class="line"><a id="l01084" name="l01084"></a><span class="lineno"> 1084</span><span class="comment">   * In fact I (ygoldfel) wrote that guy&#39;s send stuff first, then I based this off it.</span></div>
<div class="line"><a id="l01085" name="l01085"></a><span class="lineno"> 1085</span><span class="comment">   * Yet there are enough differences to where code reuse isn&#39;t really obviously achievable.</span></div>
<div class="line"><a id="l01086" name="l01086"></a><span class="lineno"> 1086</span><span class="comment">   * @todo Look into it.  Don&#39;t forget async_end_sending() that calls us: also quite similar to their counterpart. */</span></div>
<div class="line"><a id="l01087" name="l01087"></a><span class="lineno"> 1087</span> </div>
<div class="line"><a id="l01088" name="l01088"></a><span class="lineno"> 1088</span>  <span class="keywordflow">if</span> (!op_started(<span class="stringliteral">&quot;async_end_sending()&quot;</span>))</div>
<div class="line"><a id="l01089" name="l01089"></a><span class="lineno"> 1089</span>  {</div>
<div class="line"><a id="l01090" name="l01090"></a><span class="lineno"> 1090</span>    <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a id="l01091" name="l01091"></a><span class="lineno"> 1091</span>  }</div>
<div class="line"><a id="l01092" name="l01092"></a><span class="lineno"> 1092</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l01093" name="l01093"></a><span class="lineno"> 1093</span> </div>
<div class="line"><a id="l01094" name="l01094"></a><span class="lineno"> 1094</span>  <span class="keywordflow">if</span> (m_finished)</div>
<div class="line"><a id="l01095" name="l01095"></a><span class="lineno"> 1095</span>  {</div>
<div class="line"><a id="l01096" name="l01096"></a><span class="lineno"> 1096</span>    FLOW_LOG_WARNING(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: User wants to end sending; we&#39;re in sends-finished &quot;</span></div>
<div class="line"><a id="l01097" name="l01097"></a><span class="lineno"> 1097</span>                     <span class="stringliteral">&quot;state already.  Ignoring.&quot;</span>);</div>
<div class="line"><a id="l01098" name="l01098"></a><span class="lineno"> 1098</span>    <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a id="l01099" name="l01099"></a><span class="lineno"> 1099</span>  }</div>
<div class="line"><a id="l01100" name="l01100"></a><span class="lineno"> 1100</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l01101" name="l01101"></a><span class="lineno"> 1101</span>  m_finished = <span class="keyword">true</span>; <span class="comment">// Cause future send_blob() to emit S_SENDS_FINISHED_CANNOT_SEND and return.</span></div>
<div class="line"><a id="l01102" name="l01102"></a><span class="lineno"> 1102</span> </div>
<div class="line"><a id="l01103" name="l01103"></a><span class="lineno"> 1103</span>  <span class="keywordtype">bool</span> qd; <span class="comment">// Set to false to report results *now*: basically true &lt;=&gt; stuff is still queued to send.</span></div>
<div class="line"><a id="l01104" name="l01104"></a><span class="lineno"> 1104</span>  <span class="keywordflow">if</span> (m_pending_err_code)</div>
<div class="line"><a id="l01105" name="l01105"></a><span class="lineno"> 1105</span>  {</div>
<div class="line"><a id="l01106" name="l01106"></a><span class="lineno"> 1106</span>    qd = <span class="keyword">false</span>; <span class="comment">// There was outgoing-pipe-ending error detected before us; so should immediately report.</span></div>
<div class="line"><a id="l01107" name="l01107"></a><span class="lineno"> 1107</span>  }</div>
<div class="line"><a id="l01108" name="l01108"></a><span class="lineno"> 1108</span>  <span class="keywordflow">else</span></div>
<div class="line"><a id="l01109" name="l01109"></a><span class="lineno"> 1109</span>  {</div>
<div class="line"><a id="l01110" name="l01110"></a><span class="lineno"> 1110</span>    <span class="comment">/* Send the payloads per aforementioned (class doc header) strategy:</span></div>
<div class="line"><a id="l01111" name="l01111"></a><span class="lineno"> 1111</span><span class="comment">     * I.e., send empty message (receiver enters CONTROL state) and immediately Control_cmd::S_END_SENDING-bearing</span></div>
<div class="line"><a id="l01112" name="l01112"></a><span class="lineno"> 1112</span><span class="comment">     * message. */</span></div>
<div class="line"><a id="l01113" name="l01113"></a><span class="lineno"> 1113</span> </div>
<div class="line"><a id="l01114" name="l01114"></a><span class="lineno"> 1114</span>    <span class="comment">// Queue has been entirely flushed (encountering error counts as: yes, flushed) &lt;=&gt; qd = false.</span></div>
<div class="line"><a id="l01115" name="l01115"></a><span class="lineno"> 1115</span>    qd = !sync_write_or_q_ctl_cmd(Control_cmd::S_END_SENDING);</div>
<div class="line"><a id="l01116" name="l01116"></a><span class="lineno"> 1116</span>    <span class="keywordflow">if</span> (qd &amp;&amp; sync_err_code_ptr_or_null)</div>
<div class="line"><a id="l01117" name="l01117"></a><span class="lineno"> 1117</span>    {</div>
<div class="line"><a id="l01118" name="l01118"></a><span class="lineno"> 1118</span>      <span class="comment">/* It has not been flushed (we will return would-block).</span></div>
<div class="line"><a id="l01119" name="l01119"></a><span class="lineno"> 1119</span><span class="comment">       * Save this to emit once everything (including the thing we just made) has been sent off, since</span></div>
<div class="line"><a id="l01120" name="l01120"></a><span class="lineno"> 1120</span><span class="comment">       * they care about completion (sync_err_code_ptr_or_null not null). */</span></div>
<div class="line"><a id="l01121" name="l01121"></a><span class="lineno"> 1121</span>      assert(m_pending_on_last_send_done_func_or_empty.empty());</div>
<div class="line"><a id="l01122" name="l01122"></a><span class="lineno"> 1122</span>      m_pending_on_last_send_done_func_or_empty = std::move(on_done_func_or_empty);</div>
<div class="line"><a id="l01123" name="l01123"></a><span class="lineno"> 1123</span>      <span class="comment">// on_done_func_or_empty is potentially hosed now.</span></div>
<div class="line"><a id="l01124" name="l01124"></a><span class="lineno"> 1124</span>    }</div>
<div class="line"><a id="l01125" name="l01125"></a><span class="lineno"> 1125</span>    <span class="comment">/* else if (qd &amp;&amp; (!sync_err_code_ptr_or_null))</span></div>
<div class="line"><a id="l01126" name="l01126"></a><span class="lineno"> 1126</span><span class="comment">     *   { on_done_func_or_empty is .empty() anyway.  Anyway they don&#39;t care about emitting result.  Done:</span></div>
<div class="line"><a id="l01127" name="l01127"></a><span class="lineno"> 1127</span><span class="comment">     *     It&#39;ll be async-sent when/if possible. }</span></div>
<div class="line"><a id="l01128" name="l01128"></a><span class="lineno"> 1128</span><span class="comment">     * else if (!qd)</span></div>
<div class="line"><a id="l01129" name="l01129"></a><span class="lineno"> 1129</span><span class="comment">     *   { All flushed synchronously.  We will emit it synchronously, if they&#39;re interested in that. } */</span></div>
<div class="line"><a id="l01130" name="l01130"></a><span class="lineno"> 1130</span>  } <span class="comment">// if (!m_pending_err_code) (but it may have become truthy inside)</span></div>
<div class="line"><a id="l01131" name="l01131"></a><span class="lineno"> 1131</span> </div>
<div class="line"><a id="l01132" name="l01132"></a><span class="lineno"> 1132</span>  <span class="comment">// Log the error, if any; report the result synchronously if applicable.</span></div>
<div class="line"><a id="l01133" name="l01133"></a><span class="lineno"> 1133</span> </div>
<div class="line"><a id="l01134" name="l01134"></a><span class="lineno"> 1134</span>  <span class="keywordflow">if</span> (m_pending_err_code)</div>
<div class="line"><a id="l01135" name="l01135"></a><span class="lineno"> 1135</span>  {</div>
<div class="line"><a id="l01136" name="l01136"></a><span class="lineno"> 1136</span>    FLOW_LOG_WARNING(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: User wanted to end sending, but error (not &quot;</span></div>
<div class="line"><a id="l01137" name="l01137"></a><span class="lineno"> 1137</span>                     <span class="stringliteral">&quot;necessarily new error) encountered on pipe synchronously when trying to send graceful-close.  &quot;</span></div>
<div class="line"><a id="l01138" name="l01138"></a><span class="lineno"> 1138</span>                     <span class="stringliteral">&quot;Nevertheless locally sends-finished state is now active.  Will report completion via &quot;</span></div>
<div class="line"><a id="l01139" name="l01139"></a><span class="lineno"> 1139</span>                     <span class="stringliteral">&quot;sync-args (if any).  Error code details follow: &quot;</span></div>
<div class="line"><a id="l01140" name="l01140"></a><span class="lineno"> 1140</span>                     <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; m_pending_err_code &lt;&lt; <span class="stringliteral">&quot;] [&quot;</span> &lt;&lt; m_pending_err_code.message() &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l01141" name="l01141"></a><span class="lineno"> 1141</span>    assert(!qd);</div>
<div class="line"><a id="l01142" name="l01142"></a><span class="lineno"> 1142</span>  }</div>
<div class="line"><a id="l01143" name="l01143"></a><span class="lineno"> 1143</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (qd)</div>
<div class="line"><a id="l01144" name="l01144"></a><span class="lineno"> 1144</span>  {</div>
<div class="line"><a id="l01145" name="l01145"></a><span class="lineno"> 1145</span>    FLOW_LOG_INFO(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: User wanted to end sending.  Success so far but &quot;</span></div>
<div class="line"><a id="l01146" name="l01146"></a><span class="lineno"> 1146</span>                  <span class="stringliteral">&quot;out-queue has payloads -- at least the graceful-close payload -- still pending while waiting for &quot;</span></div>
<div class="line"><a id="l01147" name="l01147"></a><span class="lineno"> 1147</span>                  <span class="stringliteral">&quot;writability.  Locally sends-finished state is now active, and the other side will be informed &quot;</span></div>
<div class="line"><a id="l01148" name="l01148"></a><span class="lineno"> 1148</span>                  <span class="stringliteral">&quot;of this barring subsequent system errors.  &quot;</span></div>
<div class="line"><a id="l01149" name="l01149"></a><span class="lineno"> 1149</span>                  <span class="stringliteral">&quot;We cannot report completion via sync-args (if any).&quot;</span>);</div>
<div class="line"><a id="l01150" name="l01150"></a><span class="lineno"> 1150</span>  }</div>
<div class="line"><a id="l01151" name="l01151"></a><span class="lineno"> 1151</span>  <span class="keywordflow">else</span> <span class="comment">// if ((!m_pending_err_code) &amp;&amp; (!qd))</span></div>
<div class="line"><a id="l01152" name="l01152"></a><span class="lineno"> 1152</span>  {</div>
<div class="line"><a id="l01153" name="l01153"></a><span class="lineno"> 1153</span>    FLOW_LOG_INFO(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: User wanted to end sending.  Immediate success: &quot;</span></div>
<div class="line"><a id="l01154" name="l01154"></a><span class="lineno"> 1154</span>                  <span class="stringliteral">&quot;out-queue flushed permanently.  &quot;</span></div>
<div class="line"><a id="l01155" name="l01155"></a><span class="lineno"> 1155</span>                  <span class="stringliteral">&quot;Locally sends-finished state is now active, and the other side will be informed of this.  &quot;</span></div>
<div class="line"><a id="l01156" name="l01156"></a><span class="lineno"> 1156</span>                  <span class="stringliteral">&quot;Locally will report completion via sync-args (if any).&quot;</span>);</div>
<div class="line"><a id="l01157" name="l01157"></a><span class="lineno"> 1157</span>  }</div>
<div class="line"><a id="l01158" name="l01158"></a><span class="lineno"> 1158</span> </div>
<div class="line"><a id="l01159" name="l01159"></a><span class="lineno"> 1159</span>  <span class="keywordflow">if</span> (sync_err_code_ptr_or_null)</div>
<div class="line"><a id="l01160" name="l01160"></a><span class="lineno"> 1160</span>  {</div>
<div class="line"><a id="l01161" name="l01161"></a><span class="lineno"> 1161</span>    *sync_err_code_ptr_or_null = qd ? <a class="code hl_enumvalue" href="namespaceipc_1_1transport_1_1error.html#adfef15ef4e76cc55d652fbd9c2797297aa667487757f9d6300f6888bac40bcc24">error::Code::S_SYNC_IO_WOULD_BLOCK</a></div>
<div class="line"><a id="l01162" name="l01162"></a><span class="lineno"> 1162</span>                                    : m_pending_err_code; <span class="comment">// Could be falsy (probably is usually).</span></div>
<div class="line"><a id="l01163" name="l01163"></a><span class="lineno"> 1163</span>  }</div>
<div class="line"><a id="l01164" name="l01164"></a><span class="lineno"> 1164</span>  <span class="comment">// else { Don&#39;t care about completion. }</span></div>
<div class="line"><a id="l01165" name="l01165"></a><span class="lineno"> 1165</span> </div>
<div class="line"><a id="l01166" name="l01166"></a><span class="lineno"> 1166</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a id="l01167" name="l01167"></a><span class="lineno"> 1167</span>} <span class="comment">// Blob_stream_mq_sender_impl::async_end_sending_impl()</span></div>
<div class="line"><a id="l01168" name="l01168"></a><span class="lineno"> 1168</span> </div>
<div class="line"><a id="l01169" name="l01169"></a><span class="lineno"> 1169</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Persistent_mq_handle&gt;</div>
<div class="line"><a id="l01170" name="l01170"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a19e169b59c90ceac14671aa324a00649"> 1170</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a19e169b59c90ceac14671aa324a00649">Blob_stream_mq_sender_impl&lt;Persistent_mq_handle&gt;::auto_ping</a>(<a class="code hl_typedef" href="namespaceipc_1_1util.html#ac66141280c3b7295a86b65209f31cc58">util::Fine_duration</a> period)</div>
<div class="line"><a id="l01171" name="l01171"></a><span class="lineno"> 1171</span>{</div>
<div class="line"><a id="l01172" name="l01172"></a><span class="lineno"> 1172</span>  <span class="keyword">using </span><a class="code hl_typedef" href="namespaceipc_1_1util.html#ac66141280c3b7295a86b65209f31cc58">util::Fine_duration</a>;</div>
<div class="line"><a id="l01173" name="l01173"></a><span class="lineno"> 1173</span>  <span class="keyword">using </span><a class="code hl_typedef" href="namespaceipc_1_1util.html#a31e67d3a017477a04b313927e2f2c733">util::Task</a>;</div>
<div class="line"><a id="l01174" name="l01174"></a><span class="lineno"> 1174</span>  <span class="keyword">using </span>boost::chrono::round;</div>
<div class="line"><a id="l01175" name="l01175"></a><span class="lineno"> 1175</span>  <span class="keyword">using </span>boost::chrono::milliseconds;</div>
<div class="line"><a id="l01176" name="l01176"></a><span class="lineno"> 1176</span> </div>
<div class="line"><a id="l01177" name="l01177"></a><span class="lineno"> 1177</span>  <span class="comment">/* We comment liberally, but tactically, inline; but please read the strategy in the class doc header&#39;s impl section.</span></div>
<div class="line"><a id="l01178" name="l01178"></a><span class="lineno"> 1178</span><span class="comment">   *</span></div>
<div class="line"><a id="l01179" name="l01179"></a><span class="lineno"> 1179</span><span class="comment">   * There is a *lot* of similarity between this and sync_io::Native_socket_stream::Impl::auto_ping().</span></div>
<div class="line"><a id="l01180" name="l01180"></a><span class="lineno"> 1180</span><span class="comment">   * In fact I (ygoldfel) wrote that guy&#39;s send stuff first, then I based this off it.</span></div>
<div class="line"><a id="l01181" name="l01181"></a><span class="lineno"> 1181</span><span class="comment">   * Yet there are enough differences to where code reuse isn&#39;t really obviously achievable.  @todo Look into it. */</span></div>
<div class="line"><a id="l01182" name="l01182"></a><span class="lineno"> 1182</span> </div>
<div class="line"><a id="l01183" name="l01183"></a><span class="lineno"> 1183</span>  <span class="keywordflow">if</span> (!op_started(<span class="stringliteral">&quot;auto_ping()&quot;</span>))</div>
<div class="line"><a id="l01184" name="l01184"></a><span class="lineno"> 1184</span>  {</div>
<div class="line"><a id="l01185" name="l01185"></a><span class="lineno"> 1185</span>    <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a id="l01186" name="l01186"></a><span class="lineno"> 1186</span>  }</div>
<div class="line"><a id="l01187" name="l01187"></a><span class="lineno"> 1187</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l01188" name="l01188"></a><span class="lineno"> 1188</span> </div>
<div class="line"><a id="l01189" name="l01189"></a><span class="lineno"> 1189</span>  assert(period.count() &gt; 0);</div>
<div class="line"><a id="l01190" name="l01190"></a><span class="lineno"> 1190</span> </div>
<div class="line"><a id="l01191" name="l01191"></a><span class="lineno"> 1191</span>  <span class="keywordflow">if</span> (m_finished)</div>
<div class="line"><a id="l01192" name="l01192"></a><span class="lineno"> 1192</span>  {</div>
<div class="line"><a id="l01193" name="l01193"></a><span class="lineno"> 1193</span>    FLOW_LOG_WARNING(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: User wants to start auto-pings, but we&#39;re in &quot;</span></div>
<div class="line"><a id="l01194" name="l01194"></a><span class="lineno"> 1194</span>                     <span class="stringliteral">&quot;sends-finished state already.  Ignoring.&quot;</span>);</div>
<div class="line"><a id="l01195" name="l01195"></a><span class="lineno"> 1195</span>    <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a id="l01196" name="l01196"></a><span class="lineno"> 1196</span>  }</div>
<div class="line"><a id="l01197" name="l01197"></a><span class="lineno"> 1197</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l01198" name="l01198"></a><span class="lineno"> 1198</span> </div>
<div class="line"><a id="l01199" name="l01199"></a><span class="lineno"> 1199</span>  <span class="comment">/* By concept requirements we are to do 2 things: send an auto-ping now as a baseline; and then make it so</span></div>
<div class="line"><a id="l01200" name="l01200"></a><span class="lineno"> 1200</span><span class="comment">   * *some* message (auto-ping or otherwise) is sent at least every `period` until *end_sending() or error. */</span></div>
<div class="line"><a id="l01201" name="l01201"></a><span class="lineno"> 1201</span> </div>
<div class="line"><a id="l01202" name="l01202"></a><span class="lineno"> 1202</span>  <span class="comment">/* Prepare/send the payload per class doc header strategy.</span></div>
<div class="line"><a id="l01203" name="l01203"></a><span class="lineno"> 1203</span><span class="comment">   * Keeping comments somewhat light, as this is essentially a much simplified version of send_blob()</span></div>
<div class="line"><a id="l01204" name="l01204"></a><span class="lineno"> 1204</span><span class="comment">   * and is very similar to what async_end_sending() does in this spot. */</span></div>
<div class="line"><a id="l01205" name="l01205"></a><span class="lineno"> 1205</span> </div>
<div class="line"><a id="l01206" name="l01206"></a><span class="lineno"> 1206</span>  <span class="keywordflow">if</span> (m_auto_ping_period != Fine_duration::zero())</div>
<div class="line"><a id="l01207" name="l01207"></a><span class="lineno"> 1207</span>  {</div>
<div class="line"><a id="l01208" name="l01208"></a><span class="lineno"> 1208</span>    FLOW_LOG_WARNING(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: User wants to start auto-pings, but this &quot;</span></div>
<div class="line"><a id="l01209" name="l01209"></a><span class="lineno"> 1209</span>                     <span class="stringliteral">&quot;has already been engaged earlier.  Ignoring.&quot;</span>);</div>
<div class="line"><a id="l01210" name="l01210"></a><span class="lineno"> 1210</span>    <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a id="l01211" name="l01211"></a><span class="lineno"> 1211</span>  }</div>
<div class="line"><a id="l01212" name="l01212"></a><span class="lineno"> 1212</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l01213" name="l01213"></a><span class="lineno"> 1213</span>  m_auto_ping_period = period; <span class="comment">// Remember this, both as flag (non-zero()) and to know how often to reschedule it.</span></div>
<div class="line"><a id="l01214" name="l01214"></a><span class="lineno"> 1214</span> </div>
<div class="line"><a id="l01215" name="l01215"></a><span class="lineno"> 1215</span>  FLOW_LOG_INFO(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: User wants to start auto-pings so that there are &quot;</span></div>
<div class="line"><a id="l01216" name="l01216"></a><span class="lineno"> 1216</span>                <span class="stringliteral">&quot;outgoing messages at least as frequently as every &quot;</span></div>
<div class="line"><a id="l01217" name="l01217"></a><span class="lineno"> 1217</span>                <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; round&lt;milliseconds&gt;(m_auto_ping_period) &lt;&lt; <span class="stringliteral">&quot;].  Sending baseline auto-ping and scheduling &quot;</span></div>
<div class="line"><a id="l01218" name="l01218"></a><span class="lineno"> 1218</span>                <span class="stringliteral">&quot;first subsequent auto-ping; it may be rescheduled if more user traffic occurs before then.&quot;</span>);</div>
<div class="line"><a id="l01219" name="l01219"></a><span class="lineno"> 1219</span> </div>
<div class="line"><a id="l01220" name="l01220"></a><span class="lineno"> 1220</span>  <span class="keywordflow">if</span> (m_pending_err_code)</div>
<div class="line"><a id="l01221" name="l01221"></a><span class="lineno"> 1221</span>  {</div>
<div class="line"><a id="l01222" name="l01222"></a><span class="lineno"> 1222</span>    <span class="comment">/* Concept does not require us to report any error via auto_ping() itself.  It&#39;s for receiver&#39;s benefit anyway.</span></div>
<div class="line"><a id="l01223" name="l01223"></a><span class="lineno"> 1223</span><span class="comment">     * The local user will discover it, assuming they have interest, via the next send_*() or *end_sending(). */</span></div>
<div class="line"><a id="l01224" name="l01224"></a><span class="lineno"> 1224</span>    FLOW_LOG_WARNING(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: User wanted to start auto-pings, but an error was &quot;</span></div>
<div class="line"><a id="l01225" name="l01225"></a><span class="lineno"> 1225</span>                     <span class="stringliteral">&quot;previously encountered on pipe; so will not auto-ping.  &quot;</span></div>
<div class="line"><a id="l01226" name="l01226"></a><span class="lineno"> 1226</span>                     <span class="stringliteral">&quot;Error code details follow: [&quot;</span> &lt;&lt; m_pending_err_code &lt;&lt; <span class="stringliteral">&quot;] &quot;</span></div>
<div class="line"><a id="l01227" name="l01227"></a><span class="lineno"> 1227</span>                     <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; m_pending_err_code.message() &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l01228" name="l01228"></a><span class="lineno"> 1228</span>    <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a id="l01229" name="l01229"></a><span class="lineno"> 1229</span>  }</div>
<div class="line"><a id="l01230" name="l01230"></a><span class="lineno"> 1230</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l01231" name="l01231"></a><span class="lineno"> 1231</span> </div>
<div class="line"><a id="l01232" name="l01232"></a><span class="lineno"> 1232</span>  sync_write_or_q_ctl_cmd(Control_cmd::S_PING);</div>
<div class="line"><a id="l01233" name="l01233"></a><span class="lineno"> 1233</span>  <span class="keywordflow">if</span> (m_pending_err_code)</div>
<div class="line"><a id="l01234" name="l01234"></a><span class="lineno"> 1234</span>  {</div>
<div class="line"><a id="l01235" name="l01235"></a><span class="lineno"> 1235</span>    FLOW_LOG_WARNING(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Wanted to send initial auto-ping but &quot;</span></div>
<div class="line"><a id="l01236" name="l01236"></a><span class="lineno"> 1236</span>                     <span class="stringliteral">&quot;detected error synchronously.  &quot;</span></div>
<div class="line"><a id="l01237" name="l01237"></a><span class="lineno"> 1237</span>                     <span class="stringliteral">&quot;Error code details follow: [&quot;</span> &lt;&lt; m_pending_err_code &lt;&lt; <span class="stringliteral">&quot;] &quot;</span></div>
<div class="line"><a id="l01238" name="l01238"></a><span class="lineno"> 1238</span>                     <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; m_pending_err_code.message() &lt;&lt; <span class="stringliteral">&quot;].  &quot;</span></div>
<div class="line"><a id="l01239" name="l01239"></a><span class="lineno"> 1239</span>                     <span class="stringliteral">&quot;Saved error code to return in next user send attempt if any; otherwise ignoring; &quot;</span></div>
<div class="line"><a id="l01240" name="l01240"></a><span class="lineno"> 1240</span>                     <span class="stringliteral">&quot;will not schedule periodic auto-pings.&quot;</span>);</div>
<div class="line"><a id="l01241" name="l01241"></a><span class="lineno"> 1241</span>    <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a id="l01242" name="l01242"></a><span class="lineno"> 1242</span>  }</div>
<div class="line"><a id="l01243" name="l01243"></a><span class="lineno"> 1243</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l01244" name="l01244"></a><span class="lineno"> 1244</span> </div>
<div class="line"><a id="l01245" name="l01245"></a><span class="lineno"> 1245</span>  <span class="comment">// Initial auto-ping partially- or fully-sent fine (anything unsent was queued).  Now schedule next one per above.</span></div>
<div class="line"><a id="l01246" name="l01246"></a><span class="lineno"> 1246</span> </div>
<div class="line"><a id="l01247" name="l01247"></a><span class="lineno"> 1247</span>  <span class="comment">/* Now we can schedule it, similarly to send_blob() and on_ev_auto_ping_now_timer_fired() itself.</span></div>
<div class="line"><a id="l01248" name="l01248"></a><span class="lineno"> 1248</span><span class="comment">   * Recall that we can&#39;t simply .async_wait(F) on some timer and have the desired code --</span></div>
<div class="line"><a id="l01249" name="l01249"></a><span class="lineno"> 1249</span><span class="comment">   * on_ev_auto_ping_now_timer_fired() which sends the ping -- be the handler F.  We have to use the sync_io</span></div>
<div class="line"><a id="l01250" name="l01250"></a><span class="lineno"> 1250</span><span class="comment">   * pattern, where the user waits on events for us... but there&#39;s no timer FD, so we do it in the separate thread and</span></div>
<div class="line"><a id="l01251" name="l01251"></a><span class="lineno"> 1251</span><span class="comment">   * then ping via a pipe. */</span></div>
<div class="line"><a id="l01252" name="l01252"></a><span class="lineno"> 1252</span> </div>
<div class="line"><a id="l01253" name="l01253"></a><span class="lineno"> 1253</span>  m_ev_wait_func(&amp;m_ev_wait_hndl_auto_ping_timer_fired_peer,</div>
<div class="line"><a id="l01254" name="l01254"></a><span class="lineno"> 1254</span>                 <span class="keyword">false</span>, <span class="comment">// Wait for read.</span></div>
<div class="line"><a id="l01255" name="l01255"></a><span class="lineno"> 1255</span>                 <span class="comment">// Once readable do this: pop pipe; send ping; schedule again.</span></div>
<div class="line"><a id="l01256" name="l01256"></a><span class="lineno"> 1256</span>                 boost::make_shared&lt;Task&gt;</div>
<div class="line"><a id="l01257" name="l01257"></a><span class="lineno"> 1257</span>                   ([<span class="keyword">this</span>]() { on_ev_auto_ping_now_timer_fired(); }));</div>
<div class="line"><a id="l01258" name="l01258"></a><span class="lineno"> 1258</span>  <span class="comment">/* Reminder: That has no effect (other than user recording stuff) until this method returns.</span></div>
<div class="line"><a id="l01259" name="l01259"></a><span class="lineno"> 1259</span><span class="comment">   * So it cannot execute concurrently or anything.  They&#39;d need to do their poll()/epoll_wait() or do so</span></div>
<div class="line"><a id="l01260" name="l01260"></a><span class="lineno"> 1260</span><span class="comment">   * indirectly by returning from the present boost.asio task (if they&#39;re running a boost.asio event loop). */</span></div>
<div class="line"><a id="l01261" name="l01261"></a><span class="lineno"> 1261</span> </div>
<div class="line"><a id="l01262" name="l01262"></a><span class="lineno"> 1262</span>  <span class="comment">/* Set up the actual timer.  The second call really does m_auto_ping_timer.async_wait().</span></div>
<div class="line"><a id="l01263" name="l01263"></a><span class="lineno"> 1263</span><span class="comment">   * Note that could fire immediately, even concurrently (if m_auto_ping_period is somehow insanely short,</span></div>
<div class="line"><a id="l01264" name="l01264"></a><span class="lineno"> 1264</span><span class="comment">   * and the timer resolution is amazing)... but it would only cause on_ev_auto_ping_now_timer_fired()</span></div>
<div class="line"><a id="l01265" name="l01265"></a><span class="lineno"> 1265</span><span class="comment">   * once they detect the pipe-readable event, which (again) can only happen after we return. */</span></div>
<div class="line"><a id="l01266" name="l01266"></a><span class="lineno"> 1266</span>  m_auto_ping_timer.expires_after(m_auto_ping_period);</div>
<div class="line"><a id="l01267" name="l01267"></a><span class="lineno"> 1267</span>  m_timer_worker.timer_async_wait(&amp;m_auto_ping_timer, m_auto_ping_timer_fired_peer);</div>
<div class="line"><a id="l01268" name="l01268"></a><span class="lineno"> 1268</span> </div>
<div class="line"><a id="l01269" name="l01269"></a><span class="lineno"> 1269</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a id="l01270" name="l01270"></a><span class="lineno"> 1270</span>} <span class="comment">// Blob_stream_mq_sender_impl::auto_ping()</span></div>
<div class="line"><a id="l01271" name="l01271"></a><span class="lineno"> 1271</span> </div>
<div class="line"><a id="l01272" name="l01272"></a><span class="lineno"> 1272</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Persistent_mq_handle&gt;</div>
<div class="line"><a id="l01273" name="l01273"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ad84b0f43cd4d1329c8bac6ea1376d3ca"> 1273</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ad84b0f43cd4d1329c8bac6ea1376d3ca">Blob_stream_mq_sender_impl&lt;Persistent_mq_handle&gt;::on_ev_auto_ping_now_timer_fired</a>()</div>
<div class="line"><a id="l01274" name="l01274"></a><span class="lineno"> 1274</span>{</div>
<div class="line"><a id="l01275" name="l01275"></a><span class="lineno"> 1275</span>  <span class="keyword">using </span><a class="code hl_typedef" href="namespaceipc_1_1util.html#ae0be7edba7e30ffa3f8b742af621f2ab">util::Blob_const</a>;</div>
<div class="line"><a id="l01276" name="l01276"></a><span class="lineno"> 1276</span>  <span class="keyword">using </span><a class="code hl_typedef" href="namespaceipc_1_1util.html#a31e67d3a017477a04b313927e2f2c733">util::Task</a>;</div>
<div class="line"><a id="l01277" name="l01277"></a><span class="lineno"> 1277</span> </div>
<div class="line"><a id="l01278" name="l01278"></a><span class="lineno"> 1278</span>  <span class="comment">/* This is an event handler!  Specifically for the *m_auto_ping_timer_fired_peer pipe reader being</span></div>
<div class="line"><a id="l01279" name="l01279"></a><span class="lineno"> 1279</span><span class="comment">   * readable.  To avoid infinite-loopiness, we&#39;d best pop the thing that was written there. */</span></div>
<div class="line"><a id="l01280" name="l01280"></a><span class="lineno"> 1280</span>  m_timer_worker.consume_timer_firing_signal(m_auto_ping_timer_fired_peer);</div>
<div class="line"><a id="l01281" name="l01281"></a><span class="lineno"> 1281</span> </div>
<div class="line"><a id="l01282" name="l01282"></a><span class="lineno"> 1282</span>  <span class="comment">// Now do the auto-ping itself.</span></div>
<div class="line"><a id="l01283" name="l01283"></a><span class="lineno"> 1283</span> </div>
<div class="line"><a id="l01284" name="l01284"></a><span class="lineno"> 1284</span>  <span class="keywordflow">if</span> (m_pending_err_code)</div>
<div class="line"><a id="l01285" name="l01285"></a><span class="lineno"> 1285</span>  {</div>
<div class="line"><a id="l01286" name="l01286"></a><span class="lineno"> 1286</span>    <span class="comment">/* Concept does not require us to report any error via auto_ping() itself.  It&#39;s for receiver&#39;s benefit anyway.</span></div>
<div class="line"><a id="l01287" name="l01287"></a><span class="lineno"> 1287</span><span class="comment">     * The local user will discover it, assuming they have interest, via the next send_*() or *end_sending(). */</span></div>
<div class="line"><a id="l01288" name="l01288"></a><span class="lineno"> 1288</span>    FLOW_LOG_WARNING(<span class="stringliteral">&quot;Blob_stream_mq_sender_impl [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Auto-ping timer fired, but an error was &quot;</span></div>
<div class="line"><a id="l01289" name="l01289"></a><span class="lineno"> 1289</span>                     <span class="stringliteral">&quot;previously encountered in 2-way pipe; so will neither auto-ping nor schedule next auto-ping.  &quot;</span></div>
<div class="line"><a id="l01290" name="l01290"></a><span class="lineno"> 1290</span>                     <span class="stringliteral">&quot;Error code details follow: [&quot;</span> &lt;&lt; m_pending_err_code &lt;&lt; <span class="stringliteral">&quot;] &quot;</span></div>
<div class="line"><a id="l01291" name="l01291"></a><span class="lineno"> 1291</span>                     <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; m_pending_err_code.message() &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l01292" name="l01292"></a><span class="lineno"> 1292</span>    <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l01293" name="l01293"></a><span class="lineno"> 1293</span>  }</div>
<div class="line"><a id="l01294" name="l01294"></a><span class="lineno"> 1294</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l01295" name="l01295"></a><span class="lineno"> 1295</span> </div>
<div class="line"><a id="l01296" name="l01296"></a><span class="lineno"> 1296</span>  <span class="keywordflow">if</span> (m_finished)</div>
<div class="line"><a id="l01297" name="l01297"></a><span class="lineno"> 1297</span>  {</div>
<div class="line"><a id="l01298" name="l01298"></a><span class="lineno"> 1298</span>    <span class="comment">// This is liable to be quite common and not of much interest at the INFO level; though it&#39;s not that verbose.</span></div>
<div class="line"><a id="l01299" name="l01299"></a><span class="lineno"> 1299</span>    FLOW_LOG_TRACE(<span class="stringliteral">&quot;Blob_stream_mq_sender_impl [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: &quot;</span></div>
<div class="line"><a id="l01300" name="l01300"></a><span class="lineno"> 1300</span>                   <span class="stringliteral">&quot;Auto-ping timer fired; but graceful-close API earlier instructed us to no-op.  No-op.&quot;</span>);</div>
<div class="line"><a id="l01301" name="l01301"></a><span class="lineno"> 1301</span>    <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l01302" name="l01302"></a><span class="lineno"> 1302</span>  }</div>
<div class="line"><a id="l01303" name="l01303"></a><span class="lineno"> 1303</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l01304" name="l01304"></a><span class="lineno"> 1304</span> </div>
<div class="line"><a id="l01305" name="l01305"></a><span class="lineno"> 1305</span>  <span class="comment">// This may be of some interest sufficient for INFO.  @todo Reconsider due to non-trivial verbosity possibly.</span></div>
<div class="line"><a id="l01306" name="l01306"></a><span class="lineno"> 1306</span>  FLOW_LOG_INFO(<span class="stringliteral">&quot;Blob_stream_mq_sender_impl [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: &quot;</span></div>
<div class="line"><a id="l01307" name="l01307"></a><span class="lineno"> 1307</span>                <span class="stringliteral">&quot;Auto-ping timer fired; sending/queueing auto-ping; scheduling for next time; it may be &quot;</span></div>
<div class="line"><a id="l01308" name="l01308"></a><span class="lineno"> 1308</span>                <span class="stringliteral">&quot;rescheduled if more user traffic occurs before then.&quot;</span>);</div>
<div class="line"><a id="l01309" name="l01309"></a><span class="lineno"> 1309</span> </div>
<div class="line"><a id="l01310" name="l01310"></a><span class="lineno"> 1310</span>  <span class="comment">// The next code is similar to the initial auto_ping().</span></div>
<div class="line"><a id="l01311" name="l01311"></a><span class="lineno"> 1311</span> </div>
<div class="line"><a id="l01312" name="l01312"></a><span class="lineno"> 1312</span>  sync_write_or_q_ctl_cmd(Control_cmd::S_PING);</div>
<div class="line"><a id="l01313" name="l01313"></a><span class="lineno"> 1313</span>  <span class="keywordflow">if</span> (m_pending_err_code)</div>
<div class="line"><a id="l01314" name="l01314"></a><span class="lineno"> 1314</span>  {</div>
<div class="line"><a id="l01315" name="l01315"></a><span class="lineno"> 1315</span>    FLOW_LOG_WARNING(<span class="stringliteral">&quot;Blob_stream_mq_sender_impl [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Wanted to send non-initial auto-ping &quot;</span></div>
<div class="line"><a id="l01316" name="l01316"></a><span class="lineno"> 1316</span>                     <span class="stringliteral">&quot;but detected error synchronously.  &quot;</span></div>
<div class="line"><a id="l01317" name="l01317"></a><span class="lineno"> 1317</span>                     <span class="stringliteral">&quot;Error code details follow: [&quot;</span> &lt;&lt; m_pending_err_code &lt;&lt; <span class="stringliteral">&quot;] &quot;</span></div>
<div class="line"><a id="l01318" name="l01318"></a><span class="lineno"> 1318</span>                     <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; m_pending_err_code.message() &lt;&lt; <span class="stringliteral">&quot;].  &quot;</span></div>
<div class="line"><a id="l01319" name="l01319"></a><span class="lineno"> 1319</span>                     <span class="stringliteral">&quot;Saved error code to return in next user send attempt if any; otherwise ignoring; &quot;</span></div>
<div class="line"><a id="l01320" name="l01320"></a><span class="lineno"> 1320</span>                     <span class="stringliteral">&quot;will not continue scheduling periodic auto-pings.&quot;</span>);</div>
<div class="line"><a id="l01321" name="l01321"></a><span class="lineno"> 1321</span>    <span class="keywordflow">return</span>;</div>
<div class="line"><a id="l01322" name="l01322"></a><span class="lineno"> 1322</span>  }</div>
<div class="line"><a id="l01323" name="l01323"></a><span class="lineno"> 1323</span>  <span class="comment">// else</span></div>
<div class="line"><a id="l01324" name="l01324"></a><span class="lineno"> 1324</span> </div>
<div class="line"><a id="l01325" name="l01325"></a><span class="lineno"> 1325</span>  m_ev_wait_func(&amp;m_ev_wait_hndl_auto_ping_timer_fired_peer,</div>
<div class="line"><a id="l01326" name="l01326"></a><span class="lineno"> 1326</span>                 <span class="keyword">false</span>, <span class="comment">// Wait for read.</span></div>
<div class="line"><a id="l01327" name="l01327"></a><span class="lineno"> 1327</span>                 boost::make_shared&lt;Task&gt;</div>
<div class="line"><a id="l01328" name="l01328"></a><span class="lineno"> 1328</span>                   ([<span class="keyword">this</span>]() { on_ev_auto_ping_now_timer_fired(); }));</div>
<div class="line"><a id="l01329" name="l01329"></a><span class="lineno"> 1329</span>  m_auto_ping_timer.expires_after(m_auto_ping_period);</div>
<div class="line"><a id="l01330" name="l01330"></a><span class="lineno"> 1330</span>  m_timer_worker.timer_async_wait(&amp;m_auto_ping_timer, m_auto_ping_timer_fired_peer);</div>
<div class="line"><a id="l01331" name="l01331"></a><span class="lineno"> 1331</span>} <span class="comment">// Blob_stream_mq_sender_impl::on_ev_auto_ping_now_timer_fired()</span></div>
<div class="line"><a id="l01332" name="l01332"></a><span class="lineno"> 1332</span> </div>
<div class="line"><a id="l01333" name="l01333"></a><span class="lineno"> 1333</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Persistent_mq_handle&gt;</div>
<div class="line"><a id="l01334" name="l01334"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a25e79124ef73da11430ce3060587f12a"> 1334</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a25e79124ef73da11430ce3060587f12a">Blob_stream_mq_sender_impl&lt;Persistent_mq_handle&gt;::sync_write_or_q_payload</a>(<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc_1_1util.html#ae0be7edba7e30ffa3f8b742af621f2ab">util::Blob_const</a>&amp; orig_blob,</div>
<div class="line"><a id="l01335" name="l01335"></a><span class="lineno"> 1335</span>                                                                               <span class="keywordtype">bool</span>* avoided_qing_or_null)</div>
<div class="line"><a id="l01336" name="l01336"></a><span class="lineno"> 1336</span>{</div>
<div class="line"><a id="l01337" name="l01337"></a><span class="lineno"> 1337</span>  <span class="keyword">using </span>flow::util::Blob;</div>
<div class="line"><a id="l01338" name="l01338"></a><span class="lineno"> 1338</span>  <span class="keyword">using </span><a class="code hl_typedef" href="namespaceipc_1_1util.html#ae0be7edba7e30ffa3f8b742af621f2ab">util::Blob_const</a>;</div>
<div class="line"><a id="l01339" name="l01339"></a><span class="lineno"> 1339</span> </div>
<div class="line"><a id="l01340" name="l01340"></a><span class="lineno"> 1340</span>  <span class="comment">/* We comment liberally, but tactically, inline; but please read the strategy in the class doc header&#39;s impl section.</span></div>
<div class="line"><a id="l01341" name="l01341"></a><span class="lineno"> 1341</span><span class="comment">   * This one is actually fairly different from sync_io::Native_socket_stream::Impl::snd_sync_write_or_q_payload(),</span></div>
<div class="line"><a id="l01342" name="l01342"></a><span class="lineno"> 1342</span><span class="comment">   * as we are dealing with a message boundary-preserving low-level transport among other differences. */</span></div>
<div class="line"><a id="l01343" name="l01343"></a><span class="lineno"> 1343</span> </div>
<div class="line"><a id="l01344" name="l01344"></a><span class="lineno"> 1344</span>  assert((!m_pending_err_code) &amp;&amp; <span class="stringliteral">&quot;After m_mq is hosed, no point in trying to do anything; pre-condition violated.&quot;</span>);</div>
<div class="line"><a id="l01345" name="l01345"></a><span class="lineno"> 1345</span> </div>
<div class="line"><a id="l01346" name="l01346"></a><span class="lineno"> 1346</span>  <span class="keywordflow">if</span> (m_pending_payloads_q.empty())</div>
<div class="line"><a id="l01347" name="l01347"></a><span class="lineno"> 1347</span>  {</div>
<div class="line"><a id="l01348" name="l01348"></a><span class="lineno"> 1348</span>    FLOW_LOG_TRACE(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Want to send low-level payload: &quot;</span></div>
<div class="line"><a id="l01349" name="l01349"></a><span class="lineno"> 1349</span>                   <span class="stringliteral">&quot;blob of size [&quot;</span> &lt;&lt; orig_blob.size() &lt;&lt; <span class="stringliteral">&quot;] &quot;</span></div>
<div class="line"><a id="l01350" name="l01350"></a><span class="lineno"> 1350</span>                   <span class="stringliteral">&quot;located @ [&quot;</span> &lt;&lt; orig_blob.data() &lt;&lt; <span class="stringliteral">&quot;]; no write is pending so proceeding immediately.  &quot;</span></div>
<div class="line"><a id="l01351" name="l01351"></a><span class="lineno"> 1351</span>                   <span class="stringliteral">&quot;Will drop if would-block? = [&quot;</span> &lt;&lt; <span class="keywordtype">bool</span>(avoided_qing_or_null) &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l01352" name="l01352"></a><span class="lineno"> 1352</span> </div>
<div class="line"><a id="l01353" name="l01353"></a><span class="lineno"> 1353</span>    <span class="keyword">const</span> <span class="keywordtype">bool</span> sent = m_mq-&gt;try_send(orig_blob, &amp;m_pending_err_code);</div>
<div class="line"><a id="l01354" name="l01354"></a><span class="lineno"> 1354</span>    <span class="keywordflow">if</span> (m_pending_err_code) <span class="comment">// It will *not* emit would-block (will just return false but no error).</span></div>
<div class="line"><a id="l01355" name="l01355"></a><span class="lineno"> 1355</span>    {</div>
<div class="line"><a id="l01356" name="l01356"></a><span class="lineno"> 1356</span>      m_mq.reset();</div>
<div class="line"><a id="l01357" name="l01357"></a><span class="lineno"> 1357</span>      <span class="comment">// Return resources.  (-&gt;try_send() logged WARNING sufficiently.)</span></div>
<div class="line"><a id="l01358" name="l01358"></a><span class="lineno"> 1358</span> </div>
<div class="line"><a id="l01359" name="l01359"></a><span class="lineno"> 1359</span>      assert(!sent);</div>
<div class="line"><a id="l01360" name="l01360"></a><span class="lineno"> 1360</span>      avoided_qing_or_null &amp;&amp; (*avoided_qing_or_null = <span class="keyword">false</span>);</div>
<div class="line"><a id="l01361" name="l01361"></a><span class="lineno"> 1361</span>      <span class="keywordflow">return</span> <span class="keyword">true</span>; <span class="comment">// Pipe-direction-ending error encountered; outgoing-direction pipe is finished forevermore.</span></div>
<div class="line"><a id="l01362" name="l01362"></a><span class="lineno"> 1362</span>    }</div>
<div class="line"><a id="l01363" name="l01363"></a><span class="lineno"> 1363</span>    <span class="comment">// else</span></div>
<div class="line"><a id="l01364" name="l01364"></a><span class="lineno"> 1364</span> </div>
<div class="line"><a id="l01365" name="l01365"></a><span class="lineno"> 1365</span>    <span class="keywordflow">if</span> (sent)</div>
<div class="line"><a id="l01366" name="l01366"></a><span class="lineno"> 1366</span>    {</div>
<div class="line"><a id="l01367" name="l01367"></a><span class="lineno"> 1367</span>      <span class="comment">// Awesome: Mainstream case: We wrote the whole thing synchronously.</span></div>
<div class="line"><a id="l01368" name="l01368"></a><span class="lineno"> 1368</span>      avoided_qing_or_null &amp;&amp; (*avoided_qing_or_null = <span class="keyword">false</span>);</div>
<div class="line"><a id="l01369" name="l01369"></a><span class="lineno"> 1369</span>      <span class="keywordflow">return</span> <span class="keyword">true</span>; <span class="comment">// Outgoing-direction pipe flushed.</span></div>
<div class="line"><a id="l01370" name="l01370"></a><span class="lineno"> 1370</span>      <span class="comment">// ^-- No error.  Logged about success in -&gt;try_send().</span></div>
<div class="line"><a id="l01371" name="l01371"></a><span class="lineno"> 1371</span>    }</div>
<div class="line"><a id="l01372" name="l01372"></a><span class="lineno"> 1372</span>    <span class="comment">// else if (!sent): Fall through.</span></div>
<div class="line"><a id="l01373" name="l01373"></a><span class="lineno"> 1373</span>  } <span class="comment">// if (m_pending_payloads_q.empty())</span></div>
<div class="line"><a id="l01374" name="l01374"></a><span class="lineno"> 1374</span>  <span class="comment">/* else if (!m_pending_payloads_q.empty())</span></div>
<div class="line"><a id="l01375" name="l01375"></a><span class="lineno"> 1375</span><span class="comment">   * { Other stuff is currently being asynchronously sent, so we can only queue our payload behind all that. } */</span></div>
<div class="line"><a id="l01376" name="l01376"></a><span class="lineno"> 1376</span> </div>
<div class="line"><a id="l01377" name="l01377"></a><span class="lineno"> 1377</span>  <span class="comment">/* At this point the payload could not be sent (either because another async write-op is in progress,</span></div>
<div class="line"><a id="l01378" name="l01378"></a><span class="lineno"> 1378</span><span class="comment">   * or not but it would-block if we tried to send now).</span></div>
<div class="line"><a id="l01379" name="l01379"></a><span class="lineno"> 1379</span><span class="comment">   * Per algorithm, we shall now have to queue it up to be sent (and if nothing is currently pending begin</span></div>
<div class="line"><a id="l01380" name="l01380"></a><span class="lineno"> 1380</span><span class="comment">   * asynchronously sending it ASAP).</span></div>
<div class="line"><a id="l01381" name="l01381"></a><span class="lineno"> 1381</span><span class="comment">   *</span></div>
<div class="line"><a id="l01382" name="l01382"></a><span class="lineno"> 1382</span><span class="comment">   * avoided_qing_or_null!=null, as of this writing used for auto-pings only, affects</span></div>
<div class="line"><a id="l01383" name="l01383"></a><span class="lineno"> 1383</span><span class="comment">   * the above as follows: As *all* of orig_blob would need to be queued (queue was already non-empty, or it</span></div>
<div class="line"><a id="l01384" name="l01384"></a><span class="lineno"> 1384</span><span class="comment">   * was empty, and -&gt;try_send() yielded would-block, by definition for *all* of orig_blob.size()), then:</span></div>
<div class="line"><a id="l01385" name="l01385"></a><span class="lineno"> 1385</span><span class="comment">   * simply pretend like it was sent fine; and continue like nothing happened.  (See our doc header for</span></div>
<div class="line"><a id="l01386" name="l01386"></a><span class="lineno"> 1386</span><span class="comment">   * rationale.) */</span></div>
<div class="line"><a id="l01387" name="l01387"></a><span class="lineno"> 1387</span>  <span class="keywordflow">if</span> (avoided_qing_or_null)</div>
<div class="line"><a id="l01388" name="l01388"></a><span class="lineno"> 1388</span>  {</div>
<div class="line"><a id="l01389" name="l01389"></a><span class="lineno"> 1389</span>    *avoided_qing_or_null = <span class="keyword">true</span>;</div>
<div class="line"><a id="l01390" name="l01390"></a><span class="lineno"> 1390</span> </div>
<div class="line"><a id="l01391" name="l01391"></a><span class="lineno"> 1391</span>    <span class="comment">/* This would happen at most every few sec (with auto-pings) and is definitely a rather interesting</span></div>
<div class="line"><a id="l01392" name="l01392"></a><span class="lineno"> 1392</span><span class="comment">     * situation though not an error; INFO is suitable. */</span></div>
<div class="line"><a id="l01393" name="l01393"></a><span class="lineno"> 1393</span>    <span class="keyword">const</span> <span class="keyword">auto</span> q_size = m_pending_payloads_q.size();</div>
<div class="line"><a id="l01394" name="l01394"></a><span class="lineno"> 1394</span>    FLOW_LOG_INFO(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Wanted to send low-level payload: &quot;</span></div>
<div class="line"><a id="l01395" name="l01395"></a><span class="lineno"> 1395</span>                  <span class="stringliteral">&quot;blob of size [&quot;</span> &lt;&lt; orig_blob.size() &lt;&lt; <span class="stringliteral">&quot;] located @ [&quot;</span> &lt;&lt; orig_blob.data() &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l01396" name="l01396"></a><span class="lineno"> 1396</span>                  <span class="stringliteral">&quot;result was would-block for all of its bytes (either because blocked-queue was non-empty &quot;</span></div>
<div class="line"><a id="l01397" name="l01397"></a><span class="lineno"> 1397</span>                  <span class="stringliteral">&quot;already, or it was empty, but payload-message would-block at this time).  &quot;</span></div>
<div class="line"><a id="l01398" name="l01398"></a><span class="lineno"> 1398</span>                  <span class="stringliteral">&quot;Therefore dropping payload (done for auto-pings at least).  Out-queue size remains &quot;</span></div>
<div class="line"><a id="l01399" name="l01399"></a><span class="lineno"> 1399</span>                  <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; q_size &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l01400" name="l01400"></a><span class="lineno"> 1400</span> </div>
<div class="line"><a id="l01401" name="l01401"></a><span class="lineno"> 1401</span>    <span class="comment">/* We won&#39;t enqueue it, so there&#39;s nothing more to do, but careful in deciding what to return:</span></div>
<div class="line"><a id="l01402" name="l01402"></a><span class="lineno"> 1402</span><span class="comment">     * If the queue is empty, we promised we would return true.  If the queue is not empty, we promised</span></div>
<div class="line"><a id="l01403" name="l01403"></a><span class="lineno"> 1403</span><span class="comment">     * we would return false.  Whether that&#39;s what we should do is subtly questionable, but as of this</span></div>
<div class="line"><a id="l01404" name="l01404"></a><span class="lineno"> 1404</span><span class="comment">     * writing what we return when avoided_qing_or_null!=null is immaterial (is ignored). */</span></div>
<div class="line"><a id="l01405" name="l01405"></a><span class="lineno"> 1405</span>    <span class="keywordflow">return</span> q_size == 0;</div>
<div class="line"><a id="l01406" name="l01406"></a><span class="lineno"> 1406</span>  }</div>
<div class="line"><a id="l01407" name="l01407"></a><span class="lineno"> 1407</span>  <span class="comment">// else if (!avoided_qing_or_null): Would-block, so queue it up.</span></div>
<div class="line"><a id="l01408" name="l01408"></a><span class="lineno"> 1408</span> </div>
<div class="line"><a id="l01409" name="l01409"></a><span class="lineno"> 1409</span>  <span class="keyword">auto</span> new_low_lvl_payload = boost::movelib::make_unique&lt;Snd_low_lvl_payload&gt;();</div>
<div class="line"><a id="l01410" name="l01410"></a><span class="lineno"> 1410</span> </div>
<div class="line"><a id="l01411" name="l01411"></a><span class="lineno"> 1411</span>  <span class="comment">/* Allocate N bytes; copy N bytes into that area.</span></div>
<div class="line"><a id="l01412" name="l01412"></a><span class="lineno"> 1412</span><span class="comment">   * This is the first and only place we copy the source blob (not counting the transmission into m_mq); we</span></div>
<div class="line"><a id="l01413" name="l01413"></a><span class="lineno"> 1413</span><span class="comment">   * have tried our best to synchronously send all of it, which would&#39;ve avoided getting here and this copy.</span></div>
<div class="line"><a id="l01414" name="l01414"></a><span class="lineno"> 1414</span><span class="comment">   * Now we have no choice.  As discussed in the class doc header, probabilistically speaking we should rarely (if</span></div>
<div class="line"><a id="l01415" name="l01415"></a><span class="lineno"> 1415</span><span class="comment">   * ever) get here (and do this annoying alloc, and copy, and later dealloc) under normal operation of both sides. */</span></div>
<div class="line"><a id="l01416" name="l01416"></a><span class="lineno"> 1416</span> </div>
<div class="line"><a id="l01417" name="l01417"></a><span class="lineno"> 1417</span>  <span class="keyword">auto</span>&amp; new_blob = new_low_lvl_payload-&gt;m_blob = Blob(get_logger());</div>
<div class="line"><a id="l01418" name="l01418"></a><span class="lineno"> 1418</span>  <span class="keywordflow">if</span> (orig_blob.size() != 0)</div>
<div class="line"><a id="l01419" name="l01419"></a><span class="lineno"> 1419</span>  {</div>
<div class="line"><a id="l01420" name="l01420"></a><span class="lineno"> 1420</span>    new_blob.assign_copy(orig_blob);</div>
<div class="line"><a id="l01421" name="l01421"></a><span class="lineno"> 1421</span>  }</div>
<div class="line"><a id="l01422" name="l01422"></a><span class="lineno"> 1422</span> </div>
<div class="line"><a id="l01423" name="l01423"></a><span class="lineno"> 1423</span>  FLOW_LOG_TRACE(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Want to send pending-from-would-block low-level &quot;</span></div>
<div class="line"><a id="l01424" name="l01424"></a><span class="lineno"> 1424</span>                 <span class="stringliteral">&quot;payload: blob of size [&quot;</span> &lt;&lt; new_low_lvl_payload-&gt;m_blob.size() &lt;&lt; <span class="stringliteral">&quot;] &quot;</span></div>
<div class="line"><a id="l01425" name="l01425"></a><span class="lineno"> 1425</span>                 <span class="stringliteral">&quot;located @ [&quot;</span> &lt;&lt; orig_blob.data() &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l01426" name="l01426"></a><span class="lineno"> 1426</span>                 <span class="stringliteral">&quot;created blob copy @ [&quot;</span> &lt;&lt; new_blob.const_buffer().data() &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l01427" name="l01427"></a><span class="lineno"> 1427</span>                 <span class="stringliteral">&quot;enqueued to out-queue which is now of size [&quot;</span> &lt;&lt; (m_pending_payloads_q.size() + 1) &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l01428" name="l01428"></a><span class="lineno"> 1428</span> </div>
<div class="line"><a id="l01429" name="l01429"></a><span class="lineno"> 1429</span>  m_pending_payloads_q.emplace(std::move(new_low_lvl_payload)); <span class="comment">// Push a new Snd_low_lvl_payload::Ptr.</span></div>
<div class="line"><a id="l01430" name="l01430"></a><span class="lineno"> 1430</span> </div>
<div class="line"><a id="l01431" name="l01431"></a><span class="lineno"> 1431</span>  <span class="keywordflow">if</span> (m_pending_payloads_q.size() == 1)</div>
<div class="line"><a id="l01432" name="l01432"></a><span class="lineno"> 1432</span>  {</div>
<div class="line"><a id="l01433" name="l01433"></a><span class="lineno"> 1433</span>    <span class="comment">/* Queue was empty; now it isn&#39;t; so start the chain of async send head=&gt;dequeue=&gt;async send head=&gt;dequeue=&gt;....</span></div>
<div class="line"><a id="l01434" name="l01434"></a><span class="lineno"> 1434</span><span class="comment">     * (In our case &quot;async send head&quot; means asking (via m_ev_wait_func) user to inform (via callback we pass</span></div>
<div class="line"><a id="l01435" name="l01435"></a><span class="lineno"> 1435</span><span class="comment">     * to m_ev_wait_func) us when would-block has cleared, call m_mq-&gt;try_send() again....</span></div>
<div class="line"><a id="l01436" name="l01436"></a><span class="lineno"> 1436</span><span class="comment">     * If we were operating directly as a boost.asio async loop then the first part would just be</span></div>
<div class="line"><a id="l01437" name="l01437"></a><span class="lineno"> 1437</span><span class="comment">     * m_mq-&gt;async_wait(); but we cannot do that; user does it for us, controlling what gets called when</span></div>
<div class="line"><a id="l01438" name="l01438"></a><span class="lineno"> 1438</span><span class="comment">     * synchronously.) */</span></div>
<div class="line"><a id="l01439" name="l01439"></a><span class="lineno"> 1439</span>    async_write_q_head_payload();</div>
<div class="line"><a id="l01440" name="l01440"></a><span class="lineno"> 1440</span>    <span class="comment">// Queue has stuff in it now.  Return false.</span></div>
<div class="line"><a id="l01441" name="l01441"></a><span class="lineno"> 1441</span>  }</div>
<div class="line"><a id="l01442" name="l01442"></a><span class="lineno"> 1442</span>  <span class="comment">// else { Queue has even more stuff in it now.  Return false. }</span></div>
<div class="line"><a id="l01443" name="l01443"></a><span class="lineno"> 1443</span> </div>
<div class="line"><a id="l01444" name="l01444"></a><span class="lineno"> 1444</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a id="l01445" name="l01445"></a><span class="lineno"> 1445</span>} <span class="comment">// Blob_stream_mq_sender_impl::sync_write_or_q_payload()</span></div>
<div class="line"><a id="l01446" name="l01446"></a><span class="lineno"> 1446</span> </div>
<div class="line"><a id="l01447" name="l01447"></a><span class="lineno"> 1447</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Persistent_mq_handle&gt;</div>
<div class="line"><a id="l01448" name="l01448"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#af7657579dd859f95c234e447246b9410"> 1448</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#af7657579dd859f95c234e447246b9410">Blob_stream_mq_sender_impl&lt;Persistent_mq_handle&gt;::sync_write_or_q_ctl_cmd</a>(<a class="code hl_enumeration" href="classipc_1_1transport_1_1Blob__stream__mq__base__impl.html#a2e46672d40fbf38cf6054edfad69e705">Control_cmd</a> cmd)</div>
<div class="line"><a id="l01449" name="l01449"></a><span class="lineno"> 1449</span>{</div>
<div class="line"><a id="l01450" name="l01450"></a><span class="lineno"> 1450</span>  <span class="keywordflow">return</span> sync_write_or_q_ctl_cmd_impl(<span class="keyword">static_cast&lt;</span>std::underlying_type_t&lt;Control_cmd&gt;<span class="keyword">&gt;</span>(cmd));</div>
<div class="line"><a id="l01451" name="l01451"></a><span class="lineno"> 1451</span>}</div>
<div class="line"><a id="l01452" name="l01452"></a><span class="lineno"> 1452</span> </div>
<div class="line"><a id="l01453" name="l01453"></a><span class="lineno"> 1453</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Persistent_mq_handle&gt;</div>
<div class="line"><a id="l01454" name="l01454"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ab8230261c54efb813aabc8a80f79fc8d"> 1454</a></span><span class="keywordtype">bool</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ab8230261c54efb813aabc8a80f79fc8d">Blob_stream_mq_sender_impl&lt;Persistent_mq_handle&gt;::sync_write_or_q_ctl_cmd_impl</a></div>
<div class="line"><a id="l01455" name="l01455"></a><span class="lineno"> 1455</span>       (std::underlying_type_t&lt;Control_cmd&gt; raw_cmd)</div>
<div class="line"><a id="l01456" name="l01456"></a><span class="lineno"> 1456</span>{</div>
<div class="line"><a id="l01457" name="l01457"></a><span class="lineno"> 1457</span>  <span class="keyword">using </span><a class="code hl_typedef" href="namespaceipc_1_1util.html#ae0be7edba7e30ffa3f8b742af621f2ab">util::Blob_const</a>;</div>
<div class="line"><a id="l01458" name="l01458"></a><span class="lineno"> 1458</span> </div>
<div class="line"><a id="l01459" name="l01459"></a><span class="lineno"> 1459</span>  <span class="comment">/* Important: For PING avoided_qing != null; for reasons explained in its doc header.  Namely:</span></div>
<div class="line"><a id="l01460" name="l01460"></a><span class="lineno"> 1460</span><span class="comment">   * Consider S_PING.</span></div>
<div class="line"><a id="l01461" name="l01461"></a><span class="lineno"> 1461</span><span class="comment">   * If both payloads (empty msg, the enum) would-block, then there are already data that would</span></div>
<div class="line"><a id="l01462" name="l01462"></a><span class="lineno"> 1462</span><span class="comment">   * signal non-idleness sitting in the kernel buffer, so the auto-ping can be safely dropped in that case.</span></div>
<div class="line"><a id="l01463" name="l01463"></a><span class="lineno"> 1463</span><span class="comment">   * If 1 was flushed, while 2 would normally be queued, then dropping the latter would make the</span></div>
<div class="line"><a id="l01464" name="l01464"></a><span class="lineno"> 1464</span><span class="comment">   * protocol stream malformed from the opposing side&#39;s point of view; so we can&#39;t just drop it. */</span></div>
<div class="line"><a id="l01465" name="l01465"></a><span class="lineno"> 1465</span>  <span class="keywordtype">bool</span> avoided_qing = <span class="keyword">false</span>;</div>
<div class="line"><a id="l01466" name="l01466"></a><span class="lineno"> 1466</span>  <span class="keywordtype">bool</span>* <span class="keyword">const</span> avoided_qing_or_null = ((raw_cmd &gt;= 0) &amp;&amp; (<a class="code hl_enumeration" href="classipc_1_1transport_1_1Blob__stream__mq__base__impl.html#a2e46672d40fbf38cf6054edfad69e705">Control_cmd</a>(raw_cmd) == Control_cmd::S_PING))</div>
<div class="line"><a id="l01467" name="l01467"></a><span class="lineno"> 1467</span>                                       ? &amp;avoided_qing : <span class="keyword">nullptr</span>;</div>
<div class="line"><a id="l01468" name="l01468"></a><span class="lineno"> 1468</span> </div>
<div class="line"><a id="l01469" name="l01469"></a><span class="lineno"> 1469</span>  <span class="comment">// Payload 1 first.</span></div>
<div class="line"><a id="l01470" name="l01470"></a><span class="lineno"> 1470</span>  <span class="keywordtype">bool</span> q_is_flushed = sync_write_or_q_payload(<a class="code hl_typedef" href="namespaceipc_1_1util.html#ae0be7edba7e30ffa3f8b742af621f2ab">Blob_const</a>(), avoided_qing_or_null);</div>
<div class="line"><a id="l01471" name="l01471"></a><span class="lineno"> 1471</span> </div>
<div class="line"><a id="l01472" name="l01472"></a><span class="lineno"> 1472</span>  <span class="comment">/* Returned true =&gt; out-queue flushed fully or dropped PING-payload-1 (avoided_qing)</span></div>
<div class="line"><a id="l01473" name="l01473"></a><span class="lineno"> 1473</span><span class="comment">   *                  or new error found (depending on m_pending_err_code).</span></div>
<div class="line"><a id="l01474" name="l01474"></a><span class="lineno"> 1474</span><span class="comment">   * Returned false =&gt; out-queue has stuff in it and will until transport writable. */</span></div>
<div class="line"><a id="l01475" name="l01475"></a><span class="lineno"> 1475</span>  <span class="keywordflow">if</span> (!m_pending_err_code)</div>
<div class="line"><a id="l01476" name="l01476"></a><span class="lineno"> 1476</span>  {</div>
<div class="line"><a id="l01477" name="l01477"></a><span class="lineno"> 1477</span>    <span class="comment">/* No error =&gt; flushed fully (so flush or queue payload 2); or queued (so queue payload 2);</span></div>
<div class="line"><a id="l01478" name="l01478"></a><span class="lineno"> 1478</span><span class="comment">     * or avoided_qing (dropped PING-payload-1). */</span></div>
<div class="line"><a id="l01479" name="l01479"></a><span class="lineno"> 1479</span>    <span class="keywordflow">if</span> (!avoided_qing)</div>
<div class="line"><a id="l01480" name="l01480"></a><span class="lineno"> 1480</span>    {</div>
<div class="line"><a id="l01481" name="l01481"></a><span class="lineno"> 1481</span>      <span class="comment">// No error, not avoided_quing =&gt; flushed fully (so flush or queue payload 2); or queued (so queue payload 2).</span></div>
<div class="line"><a id="l01482" name="l01482"></a><span class="lineno"> 1482</span>      q_is_flushed</div>
<div class="line"><a id="l01483" name="l01483"></a><span class="lineno"> 1483</span>        = sync_write_or_q_payload(<a class="code hl_typedef" href="namespaceipc_1_1util.html#ae0be7edba7e30ffa3f8b742af621f2ab">Blob_const</a>(&amp;raw_cmd, <span class="keyword">sizeof</span>(raw_cmd)), <span class="keyword">nullptr</span>);</div>
<div class="line"><a id="l01484" name="l01484"></a><span class="lineno"> 1484</span>      assert(!(m_pending_err_code &amp;&amp; (!q_is_flushed)));</div>
<div class="line"><a id="l01485" name="l01485"></a><span class="lineno"> 1485</span>    }</div>
<div class="line"><a id="l01486" name="l01486"></a><span class="lineno"> 1486</span>    <span class="comment">/* else if (avoided_qing)</span></div>
<div class="line"><a id="l01487" name="l01487"></a><span class="lineno"> 1487</span><span class="comment">     * {</span></div>
<div class="line"><a id="l01488" name="l01488"></a><span class="lineno"> 1488</span><span class="comment">     *   No error, avoided_quing =&gt; dropped payload 1 due to would-block (so drop payload 2 too: do nothing).</span></div>
<div class="line"><a id="l01489" name="l01489"></a><span class="lineno"> 1489</span><span class="comment">     *   q_is_flushed is set to this or that depending on queue size (as of this writing PINGing code does not care).</span></div>
<div class="line"><a id="l01490" name="l01490"></a><span class="lineno"> 1490</span><span class="comment">     * } */</span></div>
<div class="line"><a id="l01491" name="l01491"></a><span class="lineno"> 1491</span>  }</div>
<div class="line"><a id="l01492" name="l01492"></a><span class="lineno"> 1492</span>  <span class="keywordflow">else</span> <span class="comment">// if (m_pending_err_code)</span></div>
<div class="line"><a id="l01493" name="l01493"></a><span class="lineno"> 1493</span>  {</div>
<div class="line"><a id="l01494" name="l01494"></a><span class="lineno"> 1494</span>    assert(q_is_flushed);</div>
<div class="line"><a id="l01495" name="l01495"></a><span class="lineno"> 1495</span>  }</div>
<div class="line"><a id="l01496" name="l01496"></a><span class="lineno"> 1496</span>  <span class="comment">/* To summarize:</span></div>
<div class="line"><a id="l01497" name="l01497"></a><span class="lineno"> 1497</span><span class="comment">   *   - Found error via payload 1, or not but did find error via payload 2 =&gt; q_is_flushed.</span></div>
<div class="line"><a id="l01498" name="l01498"></a><span class="lineno"> 1498</span><span class="comment">   *   - Found no error, and flushed payload 1 and payload 2 =&gt; q_is_flushed.</span></div>
<div class="line"><a id="l01499" name="l01499"></a><span class="lineno"> 1499</span><span class="comment">   *   - Found no error, but had to queue payload 1 or both payloads =&gt; !q_is_flushed.</span></div>
<div class="line"><a id="l01500" name="l01500"></a><span class="lineno"> 1500</span><span class="comment">   *   - Dropped both payloads due to their comprising PING in a would-block situation when payload 1 was tried</span></div>
<div class="line"><a id="l01501" name="l01501"></a><span class="lineno"> 1501</span><span class="comment">   *     =&gt; depends on whether queue was (and thus remains) empty at the time payload 1 was tried. */</span></div>
<div class="line"><a id="l01502" name="l01502"></a><span class="lineno"> 1502</span> </div>
<div class="line"><a id="l01503" name="l01503"></a><span class="lineno"> 1503</span>  <span class="keywordflow">return</span> q_is_flushed;</div>
<div class="line"><a id="l01504" name="l01504"></a><span class="lineno"> 1504</span>} <span class="comment">// Blob_stream_mq_sender_impl::sync_write_or_q_ctl_cmd_impl()</span></div>
<div class="line"><a id="l01505" name="l01505"></a><span class="lineno"> 1505</span> </div>
<div class="line"><a id="l01506" name="l01506"></a><span class="lineno"> 1506</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Persistent_mq_handle&gt;</div>
<div class="line"><a id="l01507" name="l01507"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a57737a56544ffac3cfd8d130663bb6ce"> 1507</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a57737a56544ffac3cfd8d130663bb6ce">Blob_stream_mq_sender_impl&lt;Persistent_mq_handle&gt;::async_write_q_head_payload</a>()</div>
<div class="line"><a id="l01508" name="l01508"></a><span class="lineno"> 1508</span>{</div>
<div class="line"><a id="l01509" name="l01509"></a><span class="lineno"> 1509</span>  <span class="keyword">using </span><a class="code hl_typedef" href="namespaceipc_1_1util.html#a31e67d3a017477a04b313927e2f2c733">util::Task</a>;</div>
<div class="line"><a id="l01510" name="l01510"></a><span class="lineno"> 1510</span>  <span class="keyword">using </span>flow::util::Lock_guard;</div>
<div class="line"><a id="l01511" name="l01511"></a><span class="lineno"> 1511</span>  <span class="keyword">using </span>boost::asio::async_write;</div>
<div class="line"><a id="l01512" name="l01512"></a><span class="lineno"> 1512</span> </div>
<div class="line"><a id="l01513" name="l01513"></a><span class="lineno"> 1513</span>  <span class="comment">/* We comment liberally, but tactically, inline; but please read the strategy in the class doc header&#39;s impl section.</span></div>
<div class="line"><a id="l01514" name="l01514"></a><span class="lineno"> 1514</span><span class="comment">   * This one is actually fairly different from sync_io::Native_socket_stream::Impl::async_write_q_head_payload(),</span></div>
<div class="line"><a id="l01515" name="l01515"></a><span class="lineno"> 1515</span><span class="comment">   * as we are dealing with a message boundary-preserving low-level transport among other differences. */</span></div>
<div class="line"><a id="l01516" name="l01516"></a><span class="lineno"> 1516</span> </div>
<div class="line"><a id="l01517" name="l01517"></a><span class="lineno"> 1517</span>  <span class="comment">// We comment liberally, but tactically, inline; but please read the strategy in the class doc header&#39;s impl section.</span></div>
<div class="line"><a id="l01518" name="l01518"></a><span class="lineno"> 1518</span> </div>
<div class="line"><a id="l01519" name="l01519"></a><span class="lineno"> 1519</span>  assert((!m_pending_payloads_q.empty()) &amp;&amp; <span class="stringliteral">&quot;Contract is stuff is queued to be async-sent.  Bug?&quot;</span>);</div>
<div class="line"><a id="l01520" name="l01520"></a><span class="lineno"> 1520</span> </div>
<div class="line"><a id="l01521" name="l01521"></a><span class="lineno"> 1521</span>  <span class="comment">/* Conceptually we&#39;d like to do m_mq-&gt;async_wait(writable, F), where F() would perform</span></div>
<div class="line"><a id="l01522" name="l01522"></a><span class="lineno"> 1522</span><span class="comment">   * m_mq-&gt;try_send() (nb-send).  However this is the sync_io pattern, so</span></div>
<div class="line"><a id="l01523" name="l01523"></a><span class="lineno"> 1523</span><span class="comment">   * the user will be performing the conceptual async_wait() for us.  We must ask them to do so</span></div>
<div class="line"><a id="l01524" name="l01524"></a><span class="lineno"> 1524</span><span class="comment">   * via m_ev_wait_func(), giving them m_mq&#39;s FD -- m_ev_wait_hndl_mq -- to wait-on. */</span></div>
<div class="line"><a id="l01525" name="l01525"></a><span class="lineno"> 1525</span> </div>
<div class="line"><a id="l01526" name="l01526"></a><span class="lineno"> 1526</span>  <span class="keywordflow">if</span> <span class="keyword">constexpr</span>(!Mq::S_HAS_NATIVE_HANDLE)</div>
<div class="line"><a id="l01527" name="l01527"></a><span class="lineno"> 1527</span>  {</div>
<div class="line"><a id="l01528" name="l01528"></a><span class="lineno"> 1528</span>    <span class="comment">/* In this case, though, m_mq has no FD; so we simulate it by awaiting writability in thread W</span></div>
<div class="line"><a id="l01529" name="l01529"></a><span class="lineno"> 1529</span><span class="comment">     * (which exists only for this purpose and is currently idle); and once that is detected we make the</span></div>
<div class="line"><a id="l01530" name="l01530"></a><span class="lineno"> 1530</span><span class="comment">     * pipe-read-end m_mq_ready_reader readable (by writing to write end):</span></div>
<div class="line"><a id="l01531" name="l01531"></a><span class="lineno"> 1531</span><span class="comment">     * *that* is watched by m_ev_wait_hndl_mq. */</span></div>
<div class="line"><a id="l01532" name="l01532"></a><span class="lineno"> 1532</span> </div>
<div class="line"><a id="l01533" name="l01533"></a><span class="lineno"> 1533</span>    <span class="comment">// So step 1 then; start the blocking wait in thread W.</span></div>
<div class="line"><a id="l01534" name="l01534"></a><span class="lineno"> 1534</span>    m_blocking_worker-&gt;post([<span class="keyword">this</span>]()</div>
<div class="line"><a id="l01535" name="l01535"></a><span class="lineno"> 1535</span>    {</div>
<div class="line"><a id="l01536" name="l01536"></a><span class="lineno"> 1536</span>      <span class="comment">// We are in thread W (the one and only code snippet that runs there).</span></div>
<div class="line"><a id="l01537" name="l01537"></a><span class="lineno"> 1537</span> </div>
<div class="line"><a id="l01538" name="l01538"></a><span class="lineno"> 1538</span>      <span class="comment">/* m_mq thread safety: See its doc header.  Spoiler alert: m_pending_payloads_q not empty, so by posting</span></div>
<div class="line"><a id="l01539" name="l01539"></a><span class="lineno"> 1539</span><span class="comment">       * this onto thread W, thread U promises not to touch m_mq until *we* tell it to via m_ev_wait_hndl_mq.</span></div>
<div class="line"><a id="l01540" name="l01540"></a><span class="lineno"> 1540</span><span class="comment">       * send_blob() will see queue is non-empty and enqueue more; similarly for *end_sending();</span></div>
<div class="line"><a id="l01541" name="l01541"></a><span class="lineno"> 1541</span><span class="comment">       * auto-ping-firing will no-op (since queue is non-empty).  The only other thing that would touch m_mq</span></div>
<div class="line"><a id="l01542" name="l01542"></a><span class="lineno"> 1542</span><span class="comment">       * (outside of dtor&#39;s m_mq-&gt;interrupt_sends()) is the async-wait-handler below -- but that will only run</span></div>
<div class="line"><a id="l01543" name="l01543"></a><span class="lineno"> 1543</span><span class="comment">       * if *we* signal it to.  So it&#39;s safe.  (That spoiler was very spoiler-y.  More of a restatement.) */</span></div>
<div class="line"><a id="l01544" name="l01544"></a><span class="lineno"> 1544</span> </div>
<div class="line"><a id="l01545" name="l01545"></a><span class="lineno"> 1545</span>      <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a> err_code;</div>
<div class="line"><a id="l01546" name="l01546"></a><span class="lineno"> 1546</span>      m_mq-&gt;wait_sendable(&amp;err_code); <span class="comment">// This will TRACE-log plenty.</span></div>
<div class="line"><a id="l01547" name="l01547"></a><span class="lineno"> 1547</span>      <span class="keywordflow">if</span> (err_code == <a class="code hl_enumvalue" href="namespaceipc_1_1transport_1_1error.html#adfef15ef4e76cc55d652fbd9c2797297a291f8a813c292ccdb475c345181653ac">error::Code::S_INTERRUPTED</a>)</div>
<div class="line"><a id="l01548" name="l01548"></a><span class="lineno"> 1548</span>      {</div>
<div class="line"><a id="l01549" name="l01549"></a><span class="lineno"> 1549</span>        FLOW_LOG_INFO(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Blocking-worker was awaiting MQ transmissibility; &quot;</span></div>
<div class="line"><a id="l01550" name="l01550"></a><span class="lineno"> 1550</span>                      <span class="stringliteral">&quot;interrupted (presumably by dtor).  Bailing out.&quot;</span>);</div>
<div class="line"><a id="l01551" name="l01551"></a><span class="lineno"> 1551</span>        <span class="keywordflow">return</span>; <span class="comment">// Dtor is shutting is down.  GTFO.</span></div>
<div class="line"><a id="l01552" name="l01552"></a><span class="lineno"> 1552</span>      }</div>
<div class="line"><a id="l01553" name="l01553"></a><span class="lineno"> 1553</span>      <span class="comment">// else</span></div>
<div class="line"><a id="l01554" name="l01554"></a><span class="lineno"> 1554</span> </div>
<div class="line"><a id="l01555" name="l01555"></a><span class="lineno"> 1555</span>      <span class="keywordflow">if</span> (err_code)</div>
<div class="line"><a id="l01556" name="l01556"></a><span class="lineno"> 1556</span>      {</div>
<div class="line"><a id="l01557" name="l01557"></a><span class="lineno"> 1557</span>        FLOW_LOG_WARNING(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Blocking-worker thread was awaiting MQ &quot;</span></div>
<div class="line"><a id="l01558" name="l01558"></a><span class="lineno"> 1558</span>                         <span class="stringliteral">&quot;transmissibility; yield error (not interrupted) -- details likely in WARNING above.  &quot;</span></div>
<div class="line"><a id="l01559" name="l01559"></a><span class="lineno"> 1559</span>                         <span class="stringliteral">&quot;We lack the means (well, the will mostly) to transmit the fact of the error &quot;</span></div>
<div class="line"><a id="l01560" name="l01560"></a><span class="lineno"> 1560</span>                         <span class="stringliteral">&quot;to user-land; so we will just report MQ-writability and let &quot;</span></div>
<div class="line"><a id="l01561" name="l01561"></a><span class="lineno"> 1561</span>                         <span class="stringliteral">&quot;user-land code uncover whatever is wrong with the MQ.  This is unusual generally.&quot;</span>);</div>
<div class="line"><a id="l01562" name="l01562"></a><span class="lineno"> 1562</span>      }</div>
<div class="line"><a id="l01563" name="l01563"></a><span class="lineno"> 1563</span>      <span class="comment">// else { No problem!  It logged enough; let us signal it. }</span></div>
<div class="line"><a id="l01564" name="l01564"></a><span class="lineno"> 1564</span>      FLOW_LOG_TRACE(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Blocking-worker thread was awaiting MQ &quot;</span></div>
<div class="line"><a id="l01565" name="l01565"></a><span class="lineno"> 1565</span>                     <span class="stringliteral">&quot;transmissibility; success; now pinging user-land via IPC-pipe.&quot;</span>);</div>
<div class="line"><a id="l01566" name="l01566"></a><span class="lineno"> 1566</span> </div>
<div class="line"><a id="l01567" name="l01567"></a><span class="lineno"> 1567</span>      <a class="code hl_function" href="namespaceipc_1_1util.html#a5429c6225cc9a271ad8c0041d99c236b">util::pipe_produce</a>(get_logger(), &amp;(*m_mq_ready_writer));</div>
<div class="line"><a id="l01568" name="l01568"></a><span class="lineno"> 1568</span>      <span class="comment">// m_mq_read_reader now has a byte to read!  m_ev_wait_hndl_mq will be event-active.</span></div>
<div class="line"><a id="l01569" name="l01569"></a><span class="lineno"> 1569</span>    }); <span class="comment">// m_blocking_worker-&gt;post()</span></div>
<div class="line"><a id="l01570" name="l01570"></a><span class="lineno"> 1570</span>  } <span class="comment">// if constexpr(!Mq::S_HAS_NATIVE_HANDLE)</span></div>
<div class="line"><a id="l01571" name="l01571"></a><span class="lineno"> 1571</span>  <span class="comment">// else if (Mq::S_HAS_NATIVE_HANDLE) { m_ev_wait_hndl_mq has the MQ&#39;s kernel-waitable handle!  Sw33t! }</span></div>
<div class="line"><a id="l01572" name="l01572"></a><span class="lineno"> 1572</span> </div>
<div class="line"><a id="l01573" name="l01573"></a><span class="lineno"> 1573</span>  <span class="keywordtype">bool</span> snd_else_rcv;</div>
<div class="line"><a id="l01574" name="l01574"></a><span class="lineno"> 1574</span>  <span class="keywordflow">if</span> <span class="keyword">constexpr</span>(Mq::S_HAS_NATIVE_HANDLE)</div>
<div class="line"><a id="l01575" name="l01575"></a><span class="lineno"> 1575</span>  {</div>
<div class="line"><a id="l01576" name="l01576"></a><span class="lineno"> 1576</span>    snd_else_rcv = <span class="keyword">true</span>; <span class="comment">// Wait for write (actual MQ!).</span></div>
<div class="line"><a id="l01577" name="l01577"></a><span class="lineno"> 1577</span>  }</div>
<div class="line"><a id="l01578" name="l01578"></a><span class="lineno"> 1578</span>  <span class="keywordflow">else</span></div>
<div class="line"><a id="l01579" name="l01579"></a><span class="lineno"> 1579</span>  {</div>
<div class="line"><a id="l01580" name="l01580"></a><span class="lineno"> 1580</span>    snd_else_rcv = <span class="keyword">false</span>; <span class="comment">// Wait for read (pipe! not actual MQ!).</span></div>
<div class="line"><a id="l01581" name="l01581"></a><span class="lineno"> 1581</span>  }</div>
<div class="line"><a id="l01582" name="l01582"></a><span class="lineno"> 1582</span> </div>
<div class="line"><a id="l01583" name="l01583"></a><span class="lineno"> 1583</span>  m_ev_wait_func(&amp;m_ev_wait_hndl_mq,</div>
<div class="line"><a id="l01584" name="l01584"></a><span class="lineno"> 1584</span>                 snd_else_rcv,</div>
<div class="line"><a id="l01585" name="l01585"></a><span class="lineno"> 1585</span>                 <span class="comment">// Once readable do this:</span></div>
<div class="line"><a id="l01586" name="l01586"></a><span class="lineno"> 1586</span>                 boost::make_shared&lt;Task&gt;</div>
<div class="line"><a id="l01587" name="l01587"></a><span class="lineno"> 1587</span>                   ([<span class="keyword">this</span>]()</div>
<div class="line"><a id="l01588" name="l01588"></a><span class="lineno"> 1588</span>  {</div>
<div class="line"><a id="l01589" name="l01589"></a><span class="lineno"> 1589</span>    <span class="comment">// We are back in *not* thread W!</span></div>
<div class="line"><a id="l01590" name="l01590"></a><span class="lineno"> 1590</span> </div>
<div class="line"><a id="l01591" name="l01591"></a><span class="lineno"> 1591</span>    FLOW_LOG_TRACE(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: User-performed wait-for-writable finished &quot;</span></div>
<div class="line"><a id="l01592" name="l01592"></a><span class="lineno"> 1592</span>                   <span class="stringliteral">&quot;(writable or error, we do not know which yet).  We endeavour to send-&gt;pop-&gt;send-&gt;... as much &quot;</span></div>
<div class="line"><a id="l01593" name="l01593"></a><span class="lineno"> 1593</span>                   <span class="stringliteral">&quot;of the queue as we can until would-block or total success.&quot;</span>);</div>
<div class="line"><a id="l01594" name="l01594"></a><span class="lineno"> 1594</span> </div>
<div class="line"><a id="l01595" name="l01595"></a><span class="lineno"> 1595</span>    assert((!m_pending_payloads_q.empty()) &amp;&amp; <span class="stringliteral">&quot;Send-queue shouldn&#39;t be touched while async-write of head is going.&quot;</span>);</div>
<div class="line"><a id="l01596" name="l01596"></a><span class="lineno"> 1596</span>    assert((!m_pending_err_code) &amp;&amp; <span class="stringliteral">&quot;Send error would only be detected by us.  Bug?&quot;</span>);</div>
<div class="line"><a id="l01597" name="l01597"></a><span class="lineno"> 1597</span> </div>
<div class="line"><a id="l01598" name="l01598"></a><span class="lineno"> 1598</span>    <span class="keywordflow">if</span> <span class="keyword">constexpr</span>(!Mq::S_HAS_NATIVE_HANDLE)</div>
<div class="line"><a id="l01599" name="l01599"></a><span class="lineno"> 1599</span>    {</div>
<div class="line"><a id="l01600" name="l01600"></a><span class="lineno"> 1600</span>      <a class="code hl_function" href="namespaceipc_1_1util.html#a814272e555c0592b0caf92b7bc3d64b3">util::pipe_consume</a>(get_logger(), &amp;(*m_mq_ready_reader)); <span class="comment">// Consume the byte to get to steady-state.</span></div>
<div class="line"><a id="l01601" name="l01601"></a><span class="lineno"> 1601</span>    }</div>
<div class="line"><a id="l01602" name="l01602"></a><span class="lineno"> 1602</span>    <span class="comment">// else { No byte was written.  In fact there&#39;s no pipe even. }</span></div>
<div class="line"><a id="l01603" name="l01603"></a><span class="lineno"> 1603</span> </div>
<div class="line"><a id="l01604" name="l01604"></a><span class="lineno"> 1604</span>    <span class="comment">// Let&#39;s do as much as we can.</span></div>
<div class="line"><a id="l01605" name="l01605"></a><span class="lineno"> 1605</span>    <span class="keywordtype">bool</span> would_block_or_error;</div>
<div class="line"><a id="l01606" name="l01606"></a><span class="lineno"> 1606</span>    <span class="keywordflow">do</span></div>
<div class="line"><a id="l01607" name="l01607"></a><span class="lineno"> 1607</span>    {</div>
<div class="line"><a id="l01608" name="l01608"></a><span class="lineno"> 1608</span>      <span class="keyword">auto</span>&amp; low_lvl_payload = *m_pending_payloads_q.front();</div>
<div class="line"><a id="l01609" name="l01609"></a><span class="lineno"> 1609</span>      <span class="keyword">auto</span>&amp; low_lvl_blob = low_lvl_payload.m_blob;</div>
<div class="line"><a id="l01610" name="l01610"></a><span class="lineno"> 1610</span>      <span class="keyword">auto</span> low_lvl_blob_view = low_lvl_blob.const_buffer();</div>
<div class="line"><a id="l01611" name="l01611"></a><span class="lineno"> 1611</span> </div>
<div class="line"><a id="l01612" name="l01612"></a><span class="lineno"> 1612</span>      FLOW_LOG_TRACE(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: &quot;</span></div>
<div class="line"><a id="l01613" name="l01613"></a><span class="lineno"> 1613</span>                     <span class="stringliteral">&quot;Out-queue size is [&quot;</span> &lt;&lt; m_pending_payloads_q.size() &lt;&lt; <span class="stringliteral">&quot;]; &quot;</span></div>
<div class="line"><a id="l01614" name="l01614"></a><span class="lineno"> 1614</span>                     <span class="stringliteral">&quot;want to send blob of size [&quot;</span> &lt;&lt; low_lvl_blob_view.size() &lt;&lt; <span class="stringliteral">&quot;] &quot;</span></div>
<div class="line"><a id="l01615" name="l01615"></a><span class="lineno"> 1615</span>                     <span class="stringliteral">&quot;located @ [&quot;</span> &lt;&lt; low_lvl_blob_view.data() &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l01616" name="l01616"></a><span class="lineno"> 1616</span>      would_block_or_error = !m_mq-&gt;try_send(low_lvl_blob_view, &amp;m_pending_err_code);</div>
<div class="line"><a id="l01617" name="l01617"></a><span class="lineno"> 1617</span>      <span class="keywordflow">if</span> (m_pending_err_code)</div>
<div class="line"><a id="l01618" name="l01618"></a><span class="lineno"> 1618</span>      {</div>
<div class="line"><a id="l01619" name="l01619"></a><span class="lineno"> 1619</span>        assert(would_block_or_error);</div>
<div class="line"><a id="l01620" name="l01620"></a><span class="lineno"> 1620</span>        assert((m_pending_err_code != <a class="code hl_enumvalue" href="namespaceipc_1_1transport_1_1error.html#adfef15ef4e76cc55d652fbd9c2797297a291f8a813c292ccdb475c345181653ac">error::Code::S_INTERRUPTED</a>) &amp;&amp;</div>
<div class="line"><a id="l01621" name="l01621"></a><span class="lineno"> 1621</span>               <span class="stringliteral">&quot;That should affect only blocking/timed-blocking MQ ops + is_*able(); not try_*().&quot;</span>);</div>
<div class="line"><a id="l01622" name="l01622"></a><span class="lineno"> 1622</span>      }</div>
<div class="line"><a id="l01623" name="l01623"></a><span class="lineno"> 1623</span>      <span class="comment">// else</span></div>
<div class="line"><a id="l01624" name="l01624"></a><span class="lineno"> 1624</span>      <span class="keywordflow">if</span> (!would_block_or_error)</div>
<div class="line"><a id="l01625" name="l01625"></a><span class="lineno"> 1625</span>      {</div>
<div class="line"><a id="l01626" name="l01626"></a><span class="lineno"> 1626</span>        m_pending_payloads_q.pop(); <span class="comment">// Nice; dealloc Blob into the aether.</span></div>
<div class="line"><a id="l01627" name="l01627"></a><span class="lineno"> 1627</span>      }</div>
<div class="line"><a id="l01628" name="l01628"></a><span class="lineno"> 1628</span>      <span class="comment">// else { That&#39;s it: party&#39;s over.  Exit loop. }</span></div>
<div class="line"><a id="l01629" name="l01629"></a><span class="lineno"> 1629</span>    }</div>
<div class="line"><a id="l01630" name="l01630"></a><span class="lineno"> 1630</span>    <span class="keywordflow">while</span> ((!m_pending_payloads_q.empty()) &amp;&amp; (!would_block_or_error));</div>
<div class="line"><a id="l01631" name="l01631"></a><span class="lineno"> 1631</span> </div>
<div class="line"><a id="l01632" name="l01632"></a><span class="lineno"> 1632</span>    <span class="comment">/* Deal with continuing async-write if necessary.</span></div>
<div class="line"><a id="l01633" name="l01633"></a><span class="lineno"> 1633</span><span class="comment">     * Deal with possibly having to fire async_end_sending() completion handler. */</span></div>
<div class="line"><a id="l01634" name="l01634"></a><span class="lineno"> 1634</span> </div>
<div class="line"><a id="l01635" name="l01635"></a><span class="lineno"> 1635</span>    <span class="keywordtype">bool</span> invoke_on_done = <span class="keyword">false</span>;</div>
<div class="line"><a id="l01636" name="l01636"></a><span class="lineno"> 1636</span>    <span class="keywordflow">if</span> (m_pending_err_code)</div>
<div class="line"><a id="l01637" name="l01637"></a><span class="lineno"> 1637</span>    {</div>
<div class="line"><a id="l01638" name="l01638"></a><span class="lineno"> 1638</span>      invoke_on_done = !m_pending_on_last_send_done_func_or_empty.empty();</div>
<div class="line"><a id="l01639" name="l01639"></a><span class="lineno"> 1639</span>      FLOW_LOG_WARNING(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: User-performed wait-for-writable reported &quot;</span></div>
<div class="line"><a id="l01640" name="l01640"></a><span class="lineno"> 1640</span>                       <span class="stringliteral">&quot;completion; wanted to nb-send any queued data and possibly initiated another &quot;</span></div>
<div class="line"><a id="l01641" name="l01641"></a><span class="lineno"> 1641</span>                       <span class="stringliteral">&quot;wait-for-writable; got error during an nb-send; TRACE details above.  &quot;</span></div>
<div class="line"><a id="l01642" name="l01642"></a><span class="lineno"> 1642</span>                       <span class="stringliteral">&quot;Error code details follow: &quot;</span></div>
<div class="line"><a id="l01643" name="l01643"></a><span class="lineno"> 1643</span>                       <span class="stringliteral">&quot;[&quot;</span> &lt;&lt; m_pending_err_code &lt;&lt; <span class="stringliteral">&quot;] [&quot;</span> &lt;&lt; m_pending_err_code.message() &lt;&lt; <span class="stringliteral">&quot;].  &quot;</span></div>
<div class="line"><a id="l01644" name="l01644"></a><span class="lineno"> 1644</span>                       <span class="stringliteral">&quot;Saved error code to return in next user send attempt if any.  &quot;</span></div>
<div class="line"><a id="l01645" name="l01645"></a><span class="lineno"> 1645</span>                       <span class="stringliteral">&quot;Will run graceful-sends-close completion handler? = [&quot;</span>  &lt;&lt; invoke_on_done &lt;&lt; <span class="stringliteral">&quot;].&quot;</span>);</div>
<div class="line"><a id="l01646" name="l01646"></a><span class="lineno"> 1646</span> </div>
<div class="line"><a id="l01647" name="l01647"></a><span class="lineno"> 1647</span>      assert((!m_pending_payloads_q.empty()) &amp;&amp; <span class="stringliteral">&quot;Opportunistic sanity check.&quot;</span>);</div>
<div class="line"><a id="l01648" name="l01648"></a><span class="lineno"> 1648</span>    }</div>
<div class="line"><a id="l01649" name="l01649"></a><span class="lineno"> 1649</span>    <span class="keywordflow">else</span> <span class="keywordflow">if</span> (m_pending_payloads_q.empty()) <span class="comment">// &amp;&amp; (!m_pending_err_code)</span></div>
<div class="line"><a id="l01650" name="l01650"></a><span class="lineno"> 1650</span>    {</div>
<div class="line"><a id="l01651" name="l01651"></a><span class="lineno"> 1651</span>      FLOW_LOG_TRACE(<span class="stringliteral">&quot;Out-queue has been emptied.&quot;</span>);</div>
<div class="line"><a id="l01652" name="l01652"></a><span class="lineno"> 1652</span> </div>
<div class="line"><a id="l01653" name="l01653"></a><span class="lineno"> 1653</span>      <span class="keywordflow">if</span> (!m_pending_on_last_send_done_func_or_empty.empty())</div>
<div class="line"><a id="l01654" name="l01654"></a><span class="lineno"> 1654</span>      {</div>
<div class="line"><a id="l01655" name="l01655"></a><span class="lineno"> 1655</span>        <span class="comment">// INFO-log is okay, as this occurs at most once per *this.</span></div>
<div class="line"><a id="l01656" name="l01656"></a><span class="lineno"> 1656</span>        FLOW_LOG_INFO(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: &quot;</span></div>
<div class="line"><a id="l01657" name="l01657"></a><span class="lineno"> 1657</span>                      <span class="stringliteral">&quot;We sent graceful-close and any preceding user messages with success.  Will now inform user via &quot;</span></div>
<div class="line"><a id="l01658" name="l01658"></a><span class="lineno"> 1658</span>                      <span class="stringliteral">&quot;graceful-sends-close completion handler.&quot;</span>);</div>
<div class="line"><a id="l01659" name="l01659"></a><span class="lineno"> 1659</span>        invoke_on_done = <span class="keyword">true</span>;</div>
<div class="line"><a id="l01660" name="l01660"></a><span class="lineno"> 1660</span>      }</div>
<div class="line"><a id="l01661" name="l01661"></a><span class="lineno"> 1661</span>    } <span class="comment">// else if (m_pending_payloads_q.empty() &amp;&amp; (!m_pending_err_code))</span></div>
<div class="line"><a id="l01662" name="l01662"></a><span class="lineno"> 1662</span>    <span class="keywordflow">else</span> <span class="comment">// if ((!m_pending_payloads_q.empty()) &amp;&amp; (!m_pending_err_code))</span></div>
<div class="line"><a id="l01663" name="l01663"></a><span class="lineno"> 1663</span>    {</div>
<div class="line"><a id="l01664" name="l01664"></a><span class="lineno"> 1664</span>      FLOW_LOG_TRACE(<span class="stringliteral">&quot;Out-queue has not been emptied.  Must keep async-send chain going.&quot;</span>);</div>
<div class="line"><a id="l01665" name="l01665"></a><span class="lineno"> 1665</span> </div>
<div class="line"><a id="l01666" name="l01666"></a><span class="lineno"> 1666</span>      <span class="comment">// Continue the chain (this guy &quot;asynchronously&quot; brought us here in the first place).</span></div>
<div class="line"><a id="l01667" name="l01667"></a><span class="lineno"> 1667</span>      async_write_q_head_payload();</div>
<div class="line"><a id="l01668" name="l01668"></a><span class="lineno"> 1668</span>      <span class="comment">// To be clear: queue can now only become empty in &quot;async&quot; handler, not synchronously here.</span></div>
<div class="line"><a id="l01669" name="l01669"></a><span class="lineno"> 1669</span>    }</div>
<div class="line"><a id="l01670" name="l01670"></a><span class="lineno"> 1670</span> </div>
<div class="line"><a id="l01671" name="l01671"></a><span class="lineno"> 1671</span>    <span class="keywordflow">if</span> (invoke_on_done)</div>
<div class="line"><a id="l01672" name="l01672"></a><span class="lineno"> 1672</span>    {</div>
<div class="line"><a id="l01673" name="l01673"></a><span class="lineno"> 1673</span>      FLOW_LOG_TRACE(<span class="stringliteral">&quot;Blob_stream_mq_sender [&quot;</span> &lt;&lt; *<span class="keyword">this</span> &lt;&lt; <span class="stringliteral">&quot;]: Executing end-sending completion handler now.&quot;</span>);</div>
<div class="line"><a id="l01674" name="l01674"></a><span class="lineno"> 1674</span>      <span class="keyword">auto</span> on_done_func = std::move(m_pending_on_last_send_done_func_or_empty);</div>
<div class="line"><a id="l01675" name="l01675"></a><span class="lineno"> 1675</span>      m_pending_on_last_send_done_func_or_empty.clear(); <span class="comment">// For cleanliness, in case move() didn&#39;t do it.</span></div>
<div class="line"><a id="l01676" name="l01676"></a><span class="lineno"> 1676</span> </div>
<div class="line"><a id="l01677" name="l01677"></a><span class="lineno"> 1677</span>      on_done_func(m_pending_err_code);</div>
<div class="line"><a id="l01678" name="l01678"></a><span class="lineno"> 1678</span>      FLOW_LOG_TRACE(<span class="stringliteral">&quot;Handler completed.&quot;</span>);</div>
<div class="line"><a id="l01679" name="l01679"></a><span class="lineno"> 1679</span>    }</div>
<div class="line"><a id="l01680" name="l01680"></a><span class="lineno"> 1680</span>  })); <span class="comment">// m_ev_wait_func(): on_active_ev_func arg</span></div>
<div class="line"><a id="l01681" name="l01681"></a><span class="lineno"> 1681</span>} <span class="comment">// Blob_stream_mq_sender_impl::async_write_q_head_payload()</span></div>
<div class="line"><a id="l01682" name="l01682"></a><span class="lineno"> 1682</span> </div>
<div class="line"><a id="l01683" name="l01683"></a><span class="lineno"> 1683</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Persistent_mq_handle&gt;</div>
<div class="line"><a id="l01684" name="l01684"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ae56c0c2aeb9fa3c34c364ec46a506994"> 1684</a></span><span class="keywordtype">size_t</span> <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ae56c0c2aeb9fa3c34c364ec46a506994">Blob_stream_mq_sender_impl&lt;Persistent_mq_handle&gt;::send_blob_max_size</a>()<span class="keyword"> const</span></div>
<div class="line"><a id="l01685" name="l01685"></a><span class="lineno"> 1685</span><span class="keyword"></span>{</div>
<div class="line"><a id="l01686" name="l01686"></a><span class="lineno"> 1686</span>  <span class="keywordflow">return</span> m_mq_max_msg_sz; <span class="comment">// As promised in concept API: never changes in PEER state.</span></div>
<div class="line"><a id="l01687" name="l01687"></a><span class="lineno"> 1687</span>}</div>
<div class="line"><a id="l01688" name="l01688"></a><span class="lineno"> 1688</span> </div>
<div class="line"><a id="l01689" name="l01689"></a><span class="lineno"> 1689</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Persistent_mq_handle&gt;</div>
<div class="line"><a id="l01690" name="l01690"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a0763f3a2891a2a0e41f3ff15f06db7cc"> 1690</a></span><span class="keyword">const</span> <a class="code hl_class" href="classipc_1_1util_1_1Shared__name.html">Shared_name</a>&amp; <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a0763f3a2891a2a0e41f3ff15f06db7cc">Blob_stream_mq_sender_impl&lt;Persistent_mq_handle&gt;::absolute_name</a>()<span class="keyword"> const</span></div>
<div class="line"><a id="l01691" name="l01691"></a><span class="lineno"> 1691</span><span class="keyword"></span>{</div>
<div class="line"><a id="l01692" name="l01692"></a><span class="lineno"> 1692</span>  <span class="keywordflow">return</span> m_absolute_name;</div>
<div class="line"><a id="l01693" name="l01693"></a><span class="lineno"> 1693</span>}</div>
<div class="line"><a id="l01694" name="l01694"></a><span class="lineno"> 1694</span> </div>
<div class="line"><a id="l01695" name="l01695"></a><span class="lineno"> 1695</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Persistent_mq_handle&gt;</div>
<div class="line"><a id="l01696" name="l01696"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ad30ee34fd91e68a084d207763e753f6d"> 1696</a></span><span class="keyword">const</span> std::string&amp; <a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ad30ee34fd91e68a084d207763e753f6d">Blob_stream_mq_sender_impl&lt;Persistent_mq_handle&gt;::nickname</a>()<span class="keyword"> const</span></div>
<div class="line"><a id="l01697" name="l01697"></a><span class="lineno"> 1697</span><span class="keyword"></span>{</div>
<div class="line"><a id="l01698" name="l01698"></a><span class="lineno"> 1698</span>  <span class="keywordflow">return</span> m_nickname;</div>
<div class="line"><a id="l01699" name="l01699"></a><span class="lineno"> 1699</span>}</div>
<div class="line"><a id="l01700" name="l01700"></a><span class="lineno"> 1700</span> </div>
<div class="line"><a id="l01701" name="l01701"></a><span class="lineno"> 1701</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Persistent_mq_handle&gt;</div>
<div class="line"><a id="l01702" name="l01702"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a8bc3464c81b40649e99da6ce2ee5f87c"> 1702</a></span>std::ostream&amp; <a class="code hl_function" href="namespaceipc_1_1transport_1_1sync__io.html#acd90efe9d59793c62bc89da75f74030d">operator&lt;&lt;</a>(std::ostream&amp; os, <span class="keyword">const</span> <a class="code hl_class" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html">Blob_stream_mq_sender_impl&lt;Persistent_mq_handle&gt;</a>&amp; val)</div>
<div class="line"><a id="l01703" name="l01703"></a><span class="lineno"> 1703</span>{</div>
<div class="line"><a id="l01704" name="l01704"></a><span class="lineno"> 1704</span>  <span class="comment">/* Tempting to just print val.m_mq and all those goodies, which include val.absolute_name() too among others,</span></div>
<div class="line"><a id="l01705" name="l01705"></a><span class="lineno"> 1705</span><span class="comment">   * as opposed to sh_name[] only; however m_mq might get hosed during this call and become null; a lock would be</span></div>
<div class="line"><a id="l01706" name="l01706"></a><span class="lineno"> 1706</span><span class="comment">   * required; not worth it. */</span></div>
<div class="line"><a id="l01707" name="l01707"></a><span class="lineno"> 1707</span>  <span class="keywordflow">return</span></div>
<div class="line"><a id="l01708" name="l01708"></a><span class="lineno"> 1708</span>    os &lt;&lt; <span class="stringliteral">&quot;SIO[&quot;</span></div>
<div class="line"><a id="l01709" name="l01709"></a><span class="lineno"> 1709</span>       &lt;&lt; val.<a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ad30ee34fd91e68a084d207763e753f6d">nickname</a>() &lt;&lt; <span class="stringliteral">&quot;]@&quot;</span> &lt;&lt; <span class="keyword">static_cast&lt;</span><span class="keyword">const </span><span class="keywordtype">void</span>*<span class="keyword">&gt;</span>(&amp;val) &lt;&lt; <span class="stringliteral">&quot; sh_name[&quot;</span> &lt;&lt; val.<a class="code hl_function" href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a0763f3a2891a2a0e41f3ff15f06db7cc">absolute_name</a>() &lt;&lt; <span class="charliteral">&#39;]&#39;</span>;</div>
<div class="line"><a id="l01710" name="l01710"></a><span class="lineno"> 1710</span>}</div>
<div class="line"><a id="l01711" name="l01711"></a><span class="lineno"> 1711</span> </div>
<div class="line"><a id="l01712" name="l01712"></a><span class="lineno"> 1712</span>} <span class="comment">// namespace ipc::transport::sync_io</span></div>
<div class="ttc" id="aasio__waitable__native__hndl_8hpp_html"><div class="ttname"><a href="asio__waitable__native__hndl_8hpp.html">asio_waitable_native_hndl.hpp</a></div></div>
<div class="ttc" id="ablob__stream__mq__impl_8hpp_html"><div class="ttname"><a href="blob__stream__mq__impl_8hpp.html">blob_stream_mq_impl.hpp</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Blob__stream__mq__base__impl_html"><div class="ttname"><a href="classipc_1_1transport_1_1Blob__stream__mq__base__impl.html">ipc::transport::Blob_stream_mq_base_impl</a></div><div class="ttdoc">Internal implementation of Blob_stream_mq_base class template; and common utilities used by Blob_stre...</div><div class="ttdef"><b>Definition:</b> <a href="blob__stream__mq__impl_8hpp_source.html#l00042">blob_stream_mq_impl.hpp:43</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Blob__stream__mq__base__impl_html_a2e46672d40fbf38cf6054edfad69e705"><div class="ttname"><a href="classipc_1_1transport_1_1Blob__stream__mq__base__impl.html#a2e46672d40fbf38cf6054edfad69e705">ipc::transport::Blob_stream_mq_base_impl::Control_cmd</a></div><div class="ttdeci">Control_cmd</div><div class="ttdoc">If Blob_stream_mq_sender_impl sends an empty message, in NORMAL state Blob_stream_mq_receiver enters ...</div><div class="ttdef"><b>Definition:</b> <a href="blob__stream__mq__impl_8hpp_source.html#l00131">blob_stream_mq_impl.hpp:132</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Blob__stream__mq__base__impl_html_a4776b5f569ccac03eccb3fc2f360fcc9"><div class="ttname"><a href="classipc_1_1transport_1_1Blob__stream__mq__base__impl.html#a4776b5f569ccac03eccb3fc2f360fcc9">ipc::transport::Blob_stream_mq_base_impl::ensure_unique_peer</a></div><div class="ttdeci">static Auto_closing_mq ensure_unique_peer(flow::log::Logger *logger_ptr, Mq &amp;&amp;mq, bool snd_else_rcv, Error_code *err_code)</div><div class="ttdoc">Internal helper for Blob_stream_mq_sender and Blob_stream_mq_receiver that operates both the start an...</div><div class="ttdef"><b>Definition:</b> <a href="blob__stream__mq__impl_8hpp_source.html#l00219">blob_stream_mq_impl.hpp:219</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Blob__stream__mq__base__impl_html_a8fac0ed5fff23aa42e0a601db6fee42d"><div class="ttname"><a href="classipc_1_1transport_1_1Blob__stream__mq__base__impl.html#a8fac0ed5fff23aa42e0a601db6fee42d">ipc::transport::Blob_stream_mq_base_impl::Mq</a></div><div class="ttdeci">Persistent_mq_handle Mq</div><div class="ttdoc">Short-hand for template arg for underlying MQ handle type.</div><div class="ttdef"><b>Definition:</b> <a href="blob__stream__mq__impl_8hpp_source.html#l00048">blob_stream_mq_impl.hpp:48</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Blob__stream__mq__base__impl_html_aab7c4c91d42c746c93e61eb367572eb1"><div class="ttname"><a href="classipc_1_1transport_1_1Blob__stream__mq__base__impl.html#aab7c4c91d42c746c93e61eb367572eb1">ipc::transport::Blob_stream_mq_base_impl::Auto_closing_mq</a></div><div class="ttdeci">boost::movelib::unique_ptr&lt; Mq, Function&lt; void(Mq *)&gt; &gt; Auto_closing_mq</div><div class="ttdoc">Persistent_mq_handle holder that takes a deleter lambda on construction, intended here to perform add...</div><div class="ttdef"><b>Definition:</b> <a href="blob__stream__mq__impl_8hpp_source.html#l00054">blob_stream_mq_impl.hpp:54</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Persistent__mq__handle_html"><div class="ttname"><a href="classipc_1_1transport_1_1Persistent__mq__handle.html">ipc::transport::Persistent_mq_handle</a></div><div class="ttdoc">A documentation-only concept defining the behavior of an object representing a light-weight handle to...</div><div class="ttdef"><b>Definition:</b> <a href="persistent__mq__handle_8hpp_source.html#l00194">persistent_mq_handle.hpp:195</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Protocol__negotiator_html"><div class="ttname"><a href="classipc_1_1transport_1_1Protocol__negotiator.html">ipc::transport::Protocol_negotiator</a></div><div class="ttdoc">A simple state machine that, assuming the opposide side of a comm pathway uses an equivalent state ma...</div><div class="ttdef"><b>Definition:</b> <a href="protocol__negotiator_8hpp_source.html#l00189">protocol_negotiator.hpp:191</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Protocol__negotiator_html_aa7e47f4f6a700aeaa9600a5426a17292"><div class="ttname"><a href="classipc_1_1transport_1_1Protocol__negotiator.html#aa7e47f4f6a700aeaa9600a5426a17292">ipc::transport::Protocol_negotiator::S_VER_UNKNOWN</a></div><div class="ttdeci">static constexpr proto_ver_t S_VER_UNKNOWN</div><div class="ttdoc">A proto_ver_t value, namely a negative one, which is a reserved value indicating &quot;unknown version&quot;; i...</div><div class="ttdef"><b>Definition:</b> <a href="protocol__negotiator_8hpp_source.html#l00215">protocol_negotiator.hpp:215</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html">ipc::transport::sync_io::Blob_stream_mq_sender_impl</a></div><div class="ttdoc">Internal, non-movable pImpl-lite implementation of sync_io::Blob_stream_mq_sender class template.</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00121">blob_stream_mq_snd_impl.hpp:125</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_a0614000879d4595c84f803ecadae708a"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a0614000879d4595c84f803ecadae708a">ipc::transport::sync_io::Blob_stream_mq_sender_impl::m_nb_task_engine</a></div><div class="ttdeci">std::optional&lt; flow::util::Task_engine &gt; m_nb_task_engine</div><div class="ttdoc">The Task_engine for m_mq_ready_*.</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00456">blob_stream_mq_snd_impl.hpp:456</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_a0763f3a2891a2a0e41f3ff15f06db7cc"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a0763f3a2891a2a0e41f3ff15f06db7cc">ipc::transport::sync_io::Blob_stream_mq_sender_impl::absolute_name</a></div><div class="ttdeci">const Shared_name &amp; absolute_name() const</div><div class="ttdoc">See Blob_stream_mq_sender counterpart, but assuming PEER state.</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l01690">blob_stream_mq_snd_impl.hpp:1690</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_a19e169b59c90ceac14671aa324a00649"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a19e169b59c90ceac14671aa324a00649">ipc::transport::sync_io::Blob_stream_mq_sender_impl::auto_ping</a></div><div class="ttdeci">bool auto_ping(util::Fine_duration period)</div><div class="ttdoc">See Blob_stream_mq_sender counterpart, but assuming PEER state.</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l01170">blob_stream_mq_snd_impl.hpp:1170</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_a25e79124ef73da11430ce3060587f12a"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a25e79124ef73da11430ce3060587f12a">ipc::transport::sync_io::Blob_stream_mq_sender_impl::sync_write_or_q_payload</a></div><div class="ttdeci">bool sync_write_or_q_payload(const util::Blob_const &amp;orig_blob, bool *avoided_qing_or_null)</div><div class="ttdoc">Either synchronously sends orig_blob low-level blob over m_mq, or if an async-send is in progress que...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l01334">blob_stream_mq_snd_impl.hpp:1334</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_a28485fe8e4fbeea78f05eadc69a31c20"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a28485fe8e4fbeea78f05eadc69a31c20">ipc::transport::sync_io::Blob_stream_mq_sender_impl::m_protocol_negotiator</a></div><div class="ttdeci">Protocol_negotiator m_protocol_negotiator</div><div class="ttdoc">Handles the protocol negotiation at the start of the pipe.</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00436">blob_stream_mq_snd_impl.hpp:436</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_a2c8029fdae05966ef05312919c85aeac"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a2c8029fdae05966ef05312919c85aeac">ipc::transport::sync_io::Blob_stream_mq_sender_impl::m_auto_ping_period</a></div><div class="ttdeci">util::Fine_duration m_auto_ping_period</div><div class="ttdoc">Equals zero() before auto_ping(); immutably equals period (auto_ping() arg) subsequently to that firs...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00575">blob_stream_mq_snd_impl.hpp:575</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_a31580924c39d2dfe9cdfa9f7cb36ccd4"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a31580924c39d2dfe9cdfa9f7cb36ccd4">ipc::transport::sync_io::Blob_stream_mq_sender_impl::m_ev_wait_hndl_mq</a></div><div class="ttdeci">util::sync_io::Asio_waitable_native_handle m_ev_wait_hndl_mq</div><div class="ttdoc">Descriptor waitable by outside event loop async-waits – storing the same Native_handle as (and thus b...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00531">blob_stream_mq_snd_impl.hpp:531</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_a32a49dff090ce4b658707e7d9b9036c9"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a32a49dff090ce4b658707e7d9b9036c9">ipc::transport::sync_io::Blob_stream_mq_sender_impl::m_mq</a></div><div class="ttdeci">Base::Auto_closing_mq m_mq</div><div class="ttdoc">The MQ handle adopted by the ctor, through which nb-sends and blocking-waits are executed.</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00489">blob_stream_mq_snd_impl.hpp:489</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_a33709386e4339aae663702488cbfe5c7"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a33709386e4339aae663702488cbfe5c7">ipc::transport::sync_io::Blob_stream_mq_sender_impl::m_blocking_worker</a></div><div class="ttdeci">std::optional&lt; flow::async::Single_thread_task_loop &gt; m_blocking_worker</div><div class="ttdoc">Worker thread W always in one of 2 states: idle; or (when m_mq is in would-block condition) executing...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00630">blob_stream_mq_snd_impl.hpp:630</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_a3a69e00d989a53f1151c64b58560551f"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a3a69e00d989a53f1151c64b58560551f">ipc::transport::sync_io::Blob_stream_mq_sender_impl::m_mq_max_msg_sz</a></div><div class="ttdeci">const size_t m_mq_max_msg_sz</div><div class="ttdoc">Equals m_mq.max_msg_size().</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00497">blob_stream_mq_snd_impl.hpp:497</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_a41bb316b2f9ca88371506ebed3890261"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a41bb316b2f9ca88371506ebed3890261">ipc::transport::sync_io::Blob_stream_mq_sender_impl::m_auto_ping_timer</a></div><div class="ttdeci">flow::util::Timer m_auto_ping_timer</div><div class="ttdoc">Timer that fires on_ev_auto_ping_now_timer_fired() (which sends an auto-ping) and is always scheduled...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00588">blob_stream_mq_snd_impl.hpp:588</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_a4709b00fb1a8fc0ea63535d0a47f15f0"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a4709b00fb1a8fc0ea63535d0a47f15f0">ipc::transport::sync_io::Blob_stream_mq_sender_impl::async_end_sending</a></div><div class="ttdeci">bool async_end_sending(Error_code *sync_err_code, Task_err &amp;&amp;on_done_func)</div><div class="ttdoc">See Blob_stream_mq_sender counterpart, but assuming PEER state.</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l01047">blob_stream_mq_snd_impl.hpp:1047</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_a48689f6fbe1a1d4df3285736326b18f4"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a48689f6fbe1a1d4df3285736326b18f4">ipc::transport::sync_io::Blob_stream_mq_sender_impl::m_pending_on_last_send_done_func_or_empty</a></div><div class="ttdeci">flow::async::Task_asio_err m_pending_on_last_send_done_func_or_empty</div><div class="ttdoc">Function passed to async_end_sending(), if it returned true and was unable to synchronously flush eve...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00569">blob_stream_mq_snd_impl.hpp:569</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_a4ea460de8caacec0ac8f75dd93f6c548"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a4ea460de8caacec0ac8f75dd93f6c548">ipc::transport::sync_io::Blob_stream_mq_sender_impl::m_absolute_name</a></div><div class="ttdeci">const Shared_name m_absolute_name</div><div class="ttdoc">See absolute_name().</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00439">blob_stream_mq_snd_impl.hpp:439</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_a50bf9bbbf413b27e6189aa4d393b9dd7"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a50bf9bbbf413b27e6189aa4d393b9dd7">ipc::transport::sync_io::Blob_stream_mq_sender_impl::m_ev_wait_hndl_auto_ping_timer_fired_peer</a></div><div class="ttdeci">util::sync_io::Asio_waitable_native_handle m_ev_wait_hndl_auto_ping_timer_fired_peer</div><div class="ttdoc">Descriptor waitable by outside event loop async-waits – storing the same Native_handle as (and thus b...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00604">blob_stream_mq_snd_impl.hpp:604</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_a57737a56544ffac3cfd8d130663bb6ce"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a57737a56544ffac3cfd8d130663bb6ce">ipc::transport::sync_io::Blob_stream_mq_sender_impl::async_write_q_head_payload</a></div><div class="ttdeci">void async_write_q_head_payload()</div><div class="ttdoc">Initiates async-write over m_mq of the low-level payload at the head of out-queue m_pending_payloads_...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l01507">blob_stream_mq_snd_impl.hpp:1507</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_a63f5f55ad38aecc5195a93bccaf23014"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a63f5f55ad38aecc5195a93bccaf23014">ipc::transport::sync_io::Blob_stream_mq_sender_impl::m_mq_ready_reader</a></div><div class="ttdeci">std::optional&lt; util::Pipe_reader &gt; m_mq_ready_reader</div><div class="ttdoc">Read-end of IPC-pipe used by thread U to detect that a thread-W transmissibility-wait has completed,...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00509">blob_stream_mq_snd_impl.hpp:509</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_a66bdd766d92029aa20d50b97edae0ce5"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a66bdd766d92029aa20d50b97edae0ce5">ipc::transport::sync_io::Blob_stream_mq_sender_impl::end_sending</a></div><div class="ttdeci">bool end_sending()</div><div class="ttdoc">See Blob_stream_mq_sender counterpart, but assuming PEER state.</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l01040">blob_stream_mq_snd_impl.hpp:1040</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_a71caa7f5002886b2c0717645945d7144"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a71caa7f5002886b2c0717645945d7144">ipc::transport::sync_io::Blob_stream_mq_sender_impl::Blob_stream_mq_sender_impl</a></div><div class="ttdeci">Blob_stream_mq_sender_impl(flow::log::Logger *logger_ptr, util::String_view nickname_str, Mq &amp;&amp;mq_moved, Error_code *err_code)</div><div class="ttdoc">See Blob_stream_mq_sender counterpart.</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00638">blob_stream_mq_snd_impl.hpp:639</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_a72c3901ca66a8d94aa22c83118aedbdd"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a72c3901ca66a8d94aa22c83118aedbdd">ipc::transport::sync_io::Blob_stream_mq_sender_impl::m_mq_ready_writer</a></div><div class="ttdeci">std::optional&lt; util::Pipe_writer &gt; m_mq_ready_writer</div><div class="ttdoc">Write-end of IPC-pipe used by thread W to inform thread U that a thread-W transmissibility-wait has c...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00520">blob_stream_mq_snd_impl.hpp:520</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_a9dca3046bc4d15657c08ac1c06f3b36d"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#a9dca3046bc4d15657c08ac1c06f3b36d">ipc::transport::sync_io::Blob_stream_mq_sender_impl::m_ev_wait_func</a></div><div class="ttdeci">util::sync_io::Event_wait_func m_ev_wait_func</div><div class="ttdoc">Function (set forever in start_send_blob_ops()) through which we invoke the outside event loop's asyn...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00611">blob_stream_mq_snd_impl.hpp:611</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_aa16854340cdf194120efd08f711c74f9"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#aa16854340cdf194120efd08f711c74f9">ipc::transport::sync_io::Blob_stream_mq_sender_impl::replace_event_wait_handles</a></div><div class="ttdeci">bool replace_event_wait_handles(const Create_ev_wait_hndl_func &amp;create_ev_wait_hndl_func)</div><div class="ttdoc">See Blob_stream_mq_sender counterpart.</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00779">blob_stream_mq_snd_impl.hpp:780</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_aa3116afe888df718c4ae10befcf2a16f"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#aa3116afe888df718c4ae10befcf2a16f">ipc::transport::sync_io::Blob_stream_mq_sender_impl::start_send_blob_ops</a></div><div class="ttdeci">bool start_send_blob_ops(util::sync_io::Event_wait_func &amp;&amp;ev_wait_func)</div><div class="ttdoc">See Blob_stream_mq_sender counterpart.</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00822">blob_stream_mq_snd_impl.hpp:823</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_aa7f092848ef3691dcf97182e5b3e2383"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#aa7f092848ef3691dcf97182e5b3e2383">ipc::transport::sync_io::Blob_stream_mq_sender_impl::op_started</a></div><div class="ttdeci">bool op_started(util::String_view context) const</div><div class="ttdoc">Helper that returns true silently if start_*_ops() has been called; else logs WARNING and returns fal...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00862">blob_stream_mq_snd_impl.hpp:862</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_aaecb4615ae4d9fbf82ab2c195ada47cf"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#aaecb4615ae4d9fbf82ab2c195ada47cf">ipc::transport::sync_io::Blob_stream_mq_sender_impl::m_pending_payloads_q</a></div><div class="ttdeci">std::queue&lt; typename Snd_low_lvl_payload::Ptr &gt; m_pending_payloads_q</div><div class="ttdoc">Queue storing (at head) the currently in-progress async write-op of a Snd_low_lvl_payload; followed b...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00548">blob_stream_mq_snd_impl.hpp:548</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_ab8230261c54efb813aabc8a80f79fc8d"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ab8230261c54efb813aabc8a80f79fc8d">ipc::transport::sync_io::Blob_stream_mq_sender_impl::sync_write_or_q_ctl_cmd_impl</a></div><div class="ttdeci">bool sync_write_or_q_ctl_cmd_impl(std::underlying_type_t&lt; Control_cmd &gt; raw_cmd)</div><div class="ttdoc">Equivalent to sync_write_or_q_ctl_cmd() but takes the raw representation of the command to send; this...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l01454">blob_stream_mq_snd_impl.hpp:1455</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_ab8bae935aff314b88d6163d04f52b5eb"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ab8bae935aff314b88d6163d04f52b5eb">ipc::transport::sync_io::Blob_stream_mq_sender_impl::m_timer_worker</a></div><div class="ttdeci">util::sync_io::Timer_event_emitter m_timer_worker</div><div class="ttdoc">As typical in timer-needing sync_io-pattern-implementing objects, maintains a thread exclusively for ...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00540">blob_stream_mq_snd_impl.hpp:540</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_ab9c3904b9cd89438c1f2de5ec974f814"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ab9c3904b9cd89438c1f2de5ec974f814">ipc::transport::sync_io::Blob_stream_mq_sender_impl::m_nickname</a></div><div class="ttdeci">const std::string m_nickname</div><div class="ttdoc">See nickname().</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00394">blob_stream_mq_snd_impl.hpp:394</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_aba05c51d1033a4ea4ca03679f2fa1f8c"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#aba05c51d1033a4ea4ca03679f2fa1f8c">ipc::transport::sync_io::Blob_stream_mq_sender_impl::send_blob</a></div><div class="ttdeci">bool send_blob(const util::Blob_const &amp;blob, Error_code *err_code)</div><div class="ttdoc">See Blob_stream_mq_sender counterpart, but assuming PEER state.</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00876">blob_stream_mq_snd_impl.hpp:876</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_abdda4c698320a44bdf479340cbed6934"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#abdda4c698320a44bdf479340cbed6934">ipc::transport::sync_io::Blob_stream_mq_sender_impl::m_ev_hndl_task_engine_unused</a></div><div class="ttdeci">flow::util::Task_engine m_ev_hndl_task_engine_unused</div><div class="ttdoc">The Task_engine for m_ev_wait_hndl_*, unless it is replaced via replace_event_wait_handles().</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00470">blob_stream_mq_snd_impl.hpp:470</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_ac4bd1d018000ca258478b62cf67cc524"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ac4bd1d018000ca258478b62cf67cc524">ipc::transport::sync_io::Blob_stream_mq_sender_impl::m_auto_ping_timer_fired_peer</a></div><div class="ttdeci">util::sync_io::Timer_event_emitter::Timer_fired_read_end * m_auto_ping_timer_fired_peer</div><div class="ttdoc">Read-end of IPC-mechanism used by m_timer_worker to ferry timer-fired events from m_auto_ping_timer t...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00596">blob_stream_mq_snd_impl.hpp:596</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_ac9712c677320d7e9d4efa83798fa8aac"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ac9712c677320d7e9d4efa83798fa8aac">ipc::transport::sync_io::Blob_stream_mq_sender_impl::m_finished</a></div><div class="ttdeci">bool m_finished</div><div class="ttdoc">false at start; set to true forever on the first *end_sending() invocation; true will prevent any sub...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00562">blob_stream_mq_snd_impl.hpp:562</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_ad30ee34fd91e68a084d207763e753f6d"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ad30ee34fd91e68a084d207763e753f6d">ipc::transport::sync_io::Blob_stream_mq_sender_impl::nickname</a></div><div class="ttdeci">const std::string &amp; nickname() const</div><div class="ttdoc">See Blob_stream_mq_sender counterpart, but assuming PEER state.</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l01696">blob_stream_mq_snd_impl.hpp:1696</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_ad84b0f43cd4d1329c8bac6ea1376d3ca"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ad84b0f43cd4d1329c8bac6ea1376d3ca">ipc::transport::sync_io::Blob_stream_mq_sender_impl::on_ev_auto_ping_now_timer_fired</a></div><div class="ttdeci">void on_ev_auto_ping_now_timer_fired()</div><div class="ttdoc">Handler for the async-wait, via util::sync_io::Timer_event_emitter, of the auto-ping timer firing; if...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l01273">blob_stream_mq_snd_impl.hpp:1273</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_adc7d43cbe05d4ad239d7abcf010955db"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#adc7d43cbe05d4ad239d7abcf010955db">ipc::transport::sync_io::Blob_stream_mq_sender_impl::async_end_sending_impl</a></div><div class="ttdeci">bool async_end_sending_impl(Error_code *sync_err_code_ptr_or_null, flow::async::Task_asio_err &amp;&amp;on_done_func_or_empty)</div><div class="ttdoc">*end_sending() body.</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l01073">blob_stream_mq_snd_impl.hpp:1074</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_ae56c0c2aeb9fa3c34c364ec46a506994"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#ae56c0c2aeb9fa3c34c364ec46a506994">ipc::transport::sync_io::Blob_stream_mq_sender_impl::send_blob_max_size</a></div><div class="ttdeci">size_t send_blob_max_size() const</div><div class="ttdoc">See Blob_stream_mq_sender counterpart, but assuming PEER state.</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l01684">blob_stream_mq_snd_impl.hpp:1684</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_af7657579dd859f95c234e447246b9410"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#af7657579dd859f95c234e447246b9410">ipc::transport::sync_io::Blob_stream_mq_sender_impl::sync_write_or_q_ctl_cmd</a></div><div class="ttdeci">bool sync_write_or_q_ctl_cmd(Control_cmd cmd)</div><div class="ttdoc">Writes the 2 payloads corresponding to CONTROL command cmd to m_mq; if unable to do so synchronously ...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l01448">blob_stream_mq_snd_impl.hpp:1448</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_afe0b25b57614615d0672c40cf8f58170"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#afe0b25b57614615d0672c40cf8f58170">ipc::transport::sync_io::Blob_stream_mq_sender_impl::~Blob_stream_mq_sender_impl</a></div><div class="ttdeci">~Blob_stream_mq_sender_impl()</div><div class="ttdoc">See Blob_stream_mq_sender counterpart.</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00751">blob_stream_mq_snd_impl.hpp:751</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_html_affd27be454f2e394f44fc76a5a4c50de"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl.html#affd27be454f2e394f44fc76a5a4c50de">ipc::transport::sync_io::Blob_stream_mq_sender_impl::m_pending_err_code</a></div><div class="ttdeci">Error_code m_pending_err_code</div><div class="ttdoc">The first and only connection-hosing error condition detected when attempting to low-level-write on m...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00555">blob_stream_mq_snd_impl.hpp:555</a></div></div>
<div class="ttc" id="aclassipc_1_1util_1_1Shared__name_html"><div class="ttname"><a href="classipc_1_1util_1_1Shared__name.html">ipc::util::Shared_name</a></div><div class="ttdoc">String-wrapping abstraction representing a name uniquely distinguishing a kernel-persistent entity fr...</div><div class="ttdef"><b>Definition:</b> <a href="shared__name_8hpp_source.html#l00241">shared_name.hpp:242</a></div></div>
<div class="ttc" id="aclassipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle_html"><div class="ttname"><a href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html">ipc::util::sync_io::Asio_waitable_native_handle</a></div><div class="ttdoc">Useful if using the sync_io pattern within a user event loop built on boost.asio (optionally with flo...</div><div class="ttdef"><b>Definition:</b> <a href="asio__waitable__native__hndl_8hpp_source.html#l00080">asio_waitable_native_hndl.hpp:81</a></div></div>
<div class="ttc" id="aclassipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle_html_a7d28277f9ef090032b0483c65f79f23c"><div class="ttname"><a href="classipc_1_1util_1_1sync__io_1_1Asio__waitable__native__handle.html#a7d28277f9ef090032b0483c65f79f23c">ipc::util::sync_io::Asio_waitable_native_handle::assign</a></div><div class="ttdeci">void assign(Native_handle hndl)</div><div class="ttdoc">Loads value to be returned by native_handle().</div><div class="ttdef"><b>Definition:</b> <a href="asio__waitable__native__hndl_8cpp_source.html#l00065">asio_waitable_native_hndl.cpp:65</a></div></div>
<div class="ttc" id="aclassipc_1_1util_1_1sync__io_1_1Timer__event__emitter_html"><div class="ttname"><a href="classipc_1_1util_1_1sync__io_1_1Timer__event__emitter.html">ipc::util::sync_io::Timer_event_emitter</a></div><div class="ttdoc">An object of this type, used internally to implement sync_io-pattern objects that require timer event...</div><div class="ttdef"><b>Definition:</b> <a href="timer__ev__emitter_8hpp_source.html#l00145">timer_ev_emitter.hpp:148</a></div></div>
<div class="ttc" id="aclassipc_1_1util_1_1sync__io_1_1Timer__event__emitter_html_a1533a54927a64579fda02c61ec94b735"><div class="ttname"><a href="classipc_1_1util_1_1sync__io_1_1Timer__event__emitter.html#a1533a54927a64579fda02c61ec94b735">ipc::util::sync_io::Timer_event_emitter::Timer_fired_read_end</a></div><div class="ttdeci">boost::asio::readable_pipe Timer_fired_read_end</div><div class="ttdoc">Object representing the read end of IPC mechanism, where readable status indicates the associated tim...</div><div class="ttdef"><b>Definition:</b> <a href="timer__ev__emitter_8hpp_source.html#l00162">timer_ev_emitter.hpp:162</a></div></div>
<div class="ttc" id="anamespaceipc_1_1transport_1_1error_html_adfef15ef4e76cc55d652fbd9c2797297a291f8a813c292ccdb475c345181653ac"><div class="ttname"><a href="namespaceipc_1_1transport_1_1error.html#adfef15ef4e76cc55d652fbd9c2797297a291f8a813c292ccdb475c345181653ac">ipc::transport::error::Code::S_INTERRUPTED</a></div><div class="ttdeci">@ S_INTERRUPTED</div><div class="ttdoc">A blocking operation was intentionally interrupted or preemptively canceled.</div></div>
<div class="ttc" id="anamespaceipc_1_1transport_1_1error_html_adfef15ef4e76cc55d652fbd9c2797297a42d41c622e92e9053177ba73e75633fe"><div class="ttname"><a href="namespaceipc_1_1transport_1_1error.html#adfef15ef4e76cc55d652fbd9c2797297a42d41c622e92e9053177ba73e75633fe">ipc::transport::error::Code::S_SENDS_FINISHED_CANNOT_SEND</a></div><div class="ttdeci">@ S_SENDS_FINISHED_CANNOT_SEND</div><div class="ttdoc">Will not send message: local user already ended sending via API marking this.</div></div>
<div class="ttc" id="anamespaceipc_1_1transport_1_1error_html_adfef15ef4e76cc55d652fbd9c2797297aa667487757f9d6300f6888bac40bcc24"><div class="ttname"><a href="namespaceipc_1_1transport_1_1error.html#adfef15ef4e76cc55d652fbd9c2797297aa667487757f9d6300f6888bac40bcc24">ipc::transport::error::Code::S_SYNC_IO_WOULD_BLOCK</a></div><div class="ttdeci">@ S_SYNC_IO_WOULD_BLOCK</div><div class="ttdoc">A sync_io operation could not immediately complete; it will complete contingent on active async-wait ...</div></div>
<div class="ttc" id="anamespaceipc_1_1transport_1_1error_html_adfef15ef4e76cc55d652fbd9c2797297ac416e988563e44bf15fc6a81743eef53"><div class="ttname"><a href="namespaceipc_1_1transport_1_1error.html#adfef15ef4e76cc55d652fbd9c2797297ac416e988563e44bf15fc6a81743eef53">ipc::transport::error::Code::S_INVALID_ARGUMENT</a></div><div class="ttdeci">@ S_INVALID_ARGUMENT</div><div class="ttdoc">User called an API with 1 or more arguments against the API spec.</div></div>
<div class="ttc" id="anamespaceipc_1_1transport_1_1sync__io_html"><div class="ttname"><a href="namespaceipc_1_1transport_1_1sync__io.html">ipc::transport::sync_io</a></div><div class="ttdoc">sync_io-pattern counterparts to async-I/O-pattern object types in parent namespace ipc::transport.</div><div class="ttdef"><b>Definition:</b> <a href="detail_2transport__fwd_8hpp_source.html#l00069">transport_fwd.hpp:70</a></div></div>
<div class="ttc" id="anamespaceipc_1_1transport_1_1sync__io_html_acd90efe9d59793c62bc89da75f74030d"><div class="ttname"><a href="namespaceipc_1_1transport_1_1sync__io.html#acd90efe9d59793c62bc89da75f74030d">ipc::transport::sync_io::operator&lt;&lt;</a></div><div class="ttdeci">std::ostream &amp; operator&lt;&lt;(std::ostream &amp;os, const Blob_stream_mq_receiver_impl&lt; Persistent_mq_handle &gt; &amp;val)</div><div class="ttdoc">Prints string representation of the given Blob_stream_mq_receiver_impl to the given ostream.</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__rcv__impl_8hpp_source.html#l01254">blob_stream_mq_rcv_impl.hpp:1254</a></div></div>
<div class="ttc" id="anamespaceipc_1_1transport_html_a7ee4551983d9df16ec16a3139bac50e8"><div class="ttname"><a href="namespaceipc_1_1transport.html#a7ee4551983d9df16ec16a3139bac50e8">ipc::transport::Native_handle</a></div><div class="ttdeci">util::Native_handle Native_handle</div><div class="ttdoc">Convenience alias for the commonly used type util::Native_handle.</div><div class="ttdef"><b>Definition:</b> <a href="transport__fwd_8hpp_source.html#l00081">transport_fwd.hpp:81</a></div></div>
<div class="ttc" id="anamespaceipc_1_1util_1_1sync__io_html_aa0b9a3cc6bdc7dedbef4f9e06851aa24"><div class="ttname"><a href="namespaceipc_1_1util_1_1sync__io.html#aa0b9a3cc6bdc7dedbef4f9e06851aa24">ipc::util::sync_io::Event_wait_func</a></div><div class="ttdeci">Function&lt; void(Asio_waitable_native_handle *hndl_of_interest, bool ev_of_interest_snd_else_rcv, Task_ptr &amp;&amp;on_active_ev_func)&gt; Event_wait_func</div><div class="ttdoc">In sync_io pattern, concrete type storing user-supplied function invoked by pattern-implementing ipc:...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io__fwd_8hpp_source.html#l00798">sync_io_fwd.hpp:800</a></div></div>
<div class="ttc" id="anamespaceipc_1_1util_html_a31e67d3a017477a04b313927e2f2c733"><div class="ttname"><a href="namespaceipc_1_1util.html#a31e67d3a017477a04b313927e2f2c733">ipc::util::Task</a></div><div class="ttdeci">flow::async::Task Task</div><div class="ttdoc">Short-hand for polymorphic function (a-la std::function&lt;&gt;) that takes no arguments and returns nothin...</div><div class="ttdef"><b>Definition:</b> <a href="util__fwd_8hpp_source.html#l00122">util_fwd.hpp:122</a></div></div>
<div class="ttc" id="anamespaceipc_1_1util_html_a5429c6225cc9a271ad8c0041d99c236b"><div class="ttname"><a href="namespaceipc_1_1util.html#a5429c6225cc9a271ad8c0041d99c236b">ipc::util::pipe_produce</a></div><div class="ttdeci">void pipe_produce(flow::log::Logger *logger_ptr, Pipe_writer *pipe)</div><div class="ttdoc">Writes a byte to the given pipe writer.</div><div class="ttdef"><b>Definition:</b> <a href="ipc__core_2src_2ipc_2util_2detail_2util_8cpp_source.html#l00067">util.cpp:67</a></div></div>
<div class="ttc" id="anamespaceipc_1_1util_html_a814272e555c0592b0caf92b7bc3d64b3"><div class="ttname"><a href="namespaceipc_1_1util.html#a814272e555c0592b0caf92b7bc3d64b3">ipc::util::pipe_consume</a></div><div class="ttdeci">void pipe_consume(flow::log::Logger *logger_ptr, Pipe_reader *pipe)</div><div class="ttdoc">Reads a byte via the given pipe reader.</div><div class="ttdef"><b>Definition:</b> <a href="ipc__core_2src_2ipc_2util_2detail_2util_8cpp_source.html#l00096">util.cpp:96</a></div></div>
<div class="ttc" id="anamespaceipc_1_1util_html_ac66141280c3b7295a86b65209f31cc58"><div class="ttname"><a href="namespaceipc_1_1util.html#ac66141280c3b7295a86b65209f31cc58">ipc::util::Fine_duration</a></div><div class="ttdeci">flow::Fine_duration Fine_duration</div><div class="ttdoc">Short-hand for Flow's Fine_duration.</div><div class="ttdef"><b>Definition:</b> <a href="util__fwd_8hpp_source.html#l00117">util_fwd.hpp:117</a></div></div>
<div class="ttc" id="anamespaceipc_1_1util_html_ae0be7edba7e30ffa3f8b742af621f2ab"><div class="ttname"><a href="namespaceipc_1_1util.html#ae0be7edba7e30ffa3f8b742af621f2ab">ipc::util::Blob_const</a></div><div class="ttdeci">boost::asio::const_buffer Blob_const</div><div class="ttdoc">Short-hand for an immutable blob somewhere in memory, stored as exactly a void const * and a size_t.</div><div class="ttdef"><b>Definition:</b> <a href="util__fwd_8hpp_source.html#l00134">util_fwd.hpp:134</a></div></div>
<div class="ttc" id="anamespaceipc_1_1util_html_ae6ac47812a90d1287c61e0b7de7bc4f5"><div class="ttname"><a href="namespaceipc_1_1util.html#ae6ac47812a90d1287c61e0b7de7bc4f5">ipc::util::String_view</a></div><div class="ttdeci">flow::util::String_view String_view</div><div class="ttdoc">Short-hand for Flow's String_view.</div><div class="ttdef"><b>Definition:</b> <a href="util__fwd_8hpp_source.html#l00115">util_fwd.hpp:115</a></div></div>
<div class="ttc" id="anamespaceipc_html_a4ccdeed058222c635745a4dc830e99f7"><div class="ttname"><a href="namespaceipc.html#a4ccdeed058222c635745a4dc830e99f7">ipc::Log_component</a></div><div class="ttdeci">Log_component</div><div class="ttdoc">The flow::log::Component payload enumeration containing various log components used by Flow-IPC inter...</div><div class="ttdef"><b>Definition:</b> <a href="common_8hpp_source.html#l00322">common.hpp:323</a></div></div>
<div class="ttc" id="anamespaceipc_html_aa3192e586cc45d3e7c22463bf2760f89"><div class="ttname"><a href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">ipc::Error_code</a></div><div class="ttdeci">flow::Error_code Error_code</div><div class="ttdoc">Short-hand for flow::Error_code which is very common.</div><div class="ttdef"><b>Definition:</b> <a href="common_8hpp_source.html#l00298">common.hpp:298</a></div></div>
<div class="ttc" id="aprotocol__negotiator_8hpp_html"><div class="ttname"><a href="protocol__negotiator_8hpp.html">protocol_negotiator.hpp</a></div></div>
<div class="ttc" id="astructipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_1_1Snd__low__lvl__payload_html"><div class="ttname"><a href="structipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_1_1Snd__low__lvl__payload.html">ipc::transport::sync_io::Blob_stream_mq_sender_impl::Snd_low_lvl_payload</a></div><div class="ttdoc">Data store representing a payload corresponding to exactly one attempted async write-op,...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00253">blob_stream_mq_snd_impl.hpp:254</a></div></div>
<div class="ttc" id="astructipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_1_1Snd__low__lvl__payload_html_a57c03ef0a637b6943df965ae0e4bf50c"><div class="ttname"><a href="structipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_1_1Snd__low__lvl__payload.html#a57c03ef0a637b6943df965ae0e4bf50c">ipc::transport::sync_io::Blob_stream_mq_sender_impl::Snd_low_lvl_payload::m_blob</a></div><div class="ttdeci">flow::util::Blob m_blob</div><div class="ttdoc">The buffer to transmit in the payload; possibly .empty().</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00270">blob_stream_mq_snd_impl.hpp:270</a></div></div>
<div class="ttc" id="astructipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_1_1Snd__low__lvl__payload_html_ad30cb6fc47d87a52a665e748b48e47ed"><div class="ttname"><a href="structipc_1_1transport_1_1sync__io_1_1Blob__stream__mq__sender__impl_1_1Snd__low__lvl__payload.html#ad30cb6fc47d87a52a665e748b48e47ed">ipc::transport::sync_io::Blob_stream_mq_sender_impl::Snd_low_lvl_payload::Ptr</a></div><div class="ttdeci">boost::movelib::unique_ptr&lt; Snd_low_lvl_payload &gt; Ptr</div><div class="ttdoc">Short-hand for unique_ptr to this.</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2detail_2blob__stream__mq__snd__impl_8hpp_source.html#l00258">blob_stream_mq_snd_impl.hpp:258</a></div></div>
<div class="ttc" id="astructipc_1_1util_1_1Native__handle_html"><div class="ttname"><a href="structipc_1_1util_1_1Native__handle.html">ipc::util::Native_handle</a></div><div class="ttdoc">A monolayer-thin wrapper around a native handle, a/k/a descriptor a/k/a FD.</div><div class="ttdef"><b>Definition:</b> <a href="native__handle_8hpp_source.html#l00062">native_handle.hpp:63</a></div></div>
<div class="ttc" id="astructipc_1_1util_1_1Native__handle_html_ab2f496740139c5752a25a30cf3325d86"><div class="ttname"><a href="structipc_1_1util_1_1Native__handle.html#ab2f496740139c5752a25a30cf3325d86">ipc::util::Native_handle::m_native_handle</a></div><div class="ttdeci">handle_t m_native_handle</div><div class="ttdoc">The native handle (possibly equal to S_NULL_HANDLE), the exact payload of this Native_handle.</div><div class="ttdef"><b>Definition:</b> <a href="native__handle_8hpp_source.html#l00085">native_handle.hpp:85</a></div></div>
<div class="ttc" id="async__io__fwd_8hpp_html"><div class="ttname"><a href="sync__io__fwd_8hpp.html">sync_io_fwd.hpp</a></div></div>
<div class="ttc" id="atimer__ev__emitter_8hpp_html"><div class="ttname"><a href="timer__ev__emitter_8hpp.html">timer_ev_emitter.hpp</a></div></div>
<div class="ttc" id="autil_8hpp_html"><div class="ttname"><a href="util_8hpp.html">util.hpp</a></div></div>
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